This article has Open Peer Review reports available.
Evaluating the effectiveness of a tailored multifaceted performance feedback intervention to improve the quality of care: protocol for a cluster randomized trial in intensive care
© van der Veer et al; licensee BioMed Central Ltd. 2011
Received: 21 March 2011
Accepted: 24 October 2011
Published: 24 October 2011
Feedback is potentially effective in improving the quality of care. However, merely sending reports is no guarantee that performance data are used as input for systematic quality improvement (QI). Therefore, we developed a multifaceted intervention tailored to prospectively analyzed barriers to using indicators: the Information Feedback on Quality Indicators (InFoQI) program. This program aims to promote the use of performance indicator data as input for local systematic QI. We will conduct a study to assess the impact of the InFoQI program on patient outcome and organizational process measures of care, and to gain insight into barriers and success factors that affected the program's impact. The study will be executed in the context of intensive care. This paper presents the study's protocol.
We will conduct a cluster randomized controlled trial with intensive care units (ICUs) in the Netherlands. We will include ICUs that submit indicator data to the Dutch National Intensive Care Evaluation (NICE) quality registry and that agree to allocate at least one intensivist and one ICU nurse for implementation of the intervention. Eligible ICUs (clusters) will be randomized to receive basic NICE registry feedback (control arm) or to participate in the InFoQI program (intervention arm). The InFoQI program consists of comprehensive feedback, establishing a local, multidisciplinary QI team, and educational outreach visits. The primary outcome measures will be length of ICU stay and the proportion of shifts with a bed occupancy rate above 80%. We will also conduct a process evaluation involving ICUs in the intervention arm to investigate their actual exposure to and experiences with the InFoQI program.
The results of this study will inform those involved in providing ICU care on the feasibility of a tailored multifaceted performance feedback intervention and its ability to accelerate systematic and local quality improvement. Although our study will be conducted within the domain of intensive care, we believe our conclusions will be generalizable to other settings that have a quality registry including an indicator set available.
Current Controlled Trials ISRCTN50542146
To systematically monitor the quality of care and develop and evaluate successful improvement interventions, data on clinical performance are essential [1, 2]. These performance data are often based on a set of quality indicators, ideally combining measures of structure, process, and outcomes of care [3, 4].
Also within the domain of intensive care, several indicator sets have been developed [5–9], and numerous quality registries have been established worldwide to routinely have indicator data available on the performance of intensive care units (ICUs) [10–13]. In the Netherlands, the National Intensive Care Evaluation (NICE) quality registry was founded in 1996 by the Dutch intensive care profession with the aim to systematically and continuously monitor, assess, and compare ICU performance, and to improve the quality of ICU care based on the outcome indicators case-mix adjusted hospital mortality and length of ICU stay . In 2006, this limited core data set of outcome indicators was extended to a total of eleven structure, process, and outcome indicators, adding items such as nurse-to-patient ratio, glucose regulation, duration of mechanical ventilation, and incidence of severe pressure ulcers. The extended set was developed by the Netherlands Society for Intensive Care (NVIC) in close collaboration with the NICE foundation .
Besides facilitating data collection and analyses, NICE-like most quality registries-also sends participants periodical feedback reports on their performance over time and in comparison with other groups of ICUs. Although feedback is potentially effective in improving the quality of care [14–16], merely sending feedback reports is no guarantee that performance data are used as input for systematic quality improvement (QI).
Problem: barriers perceived by health care professionals to using performance feedback for systematic quality improvement
Previous systematic reviews reported potential barriers at different levels to using performance data for systematic improvement of health care, e.g., insufficient data quality, no acknowledgement of the room for improvement in current practice, or lack of resources to implement quality interventions [15, 16]. The results of a validated questionnaire completed by 142 health care professionals working at 54 Dutch ICUs confirmed that such barriers also exist within the context of intensive care . As suggested by others [18, 19], we translated these prospectively identified barriers into a multifaceted QI intervention using input from future users, expert knowledge, and evidence from literature. The table in 'Additional file 1' contains all barriers identified and how they are targeted by the intervention. We named the resulting QI program InFoQI (In formation F eedback o n Q uality I ndicators). InFoQI was developed and will be evaluated within the context of intensive care and the Dutch NICE registry. By targeting the potential barriers to using performance feedback as input for systematic QI activities at ICUs, the InFoQI program ultimately aims to improve the quality of intensive care.
To assess the impact of the InFoQI program on patient outcome and organizational process measures of ICU care.
To gain insight into the barriers and success factors that affected the program's impact.
The InFoQI program was designed to overcome the previously identified barriers to using performance indicator data as input for local QI activities. Based on this assumption we hypothesize that ICUs participating in the InFoQI program will improve the quality of their care significantly more than ICUs receiving basic feedback from the NICE registry.
The results of this study will inform those involved in providing ICU care on the feasibility of the InFoQI program and its ability to accelerate systematic, local QI at ICUs. More in general, we believe that our results might be of interest to clinicians and organizations in any setting that use a quality registry including performance indicators to continuously monitor and improve the quality of care.
We will execute a cluster randomized controlled trial to compare facilities participating in the InFoQI program (intervention arm) to facilities receiving basic feedback from the NICE registry (control arm). Because the InFoQI program will be implemented at the facility rather than individual level, a cluster randomized trial is the preferred design for the evaluation of the program's effectiveness . Like most trials aimed at evaluating organizational interventions, our study is pragmatic . To apply to current standards, the study has been designed and will be reported in accordance with the CONSORT statement  and the appropriate extensions [23, 24].
The setting of our study is Dutch intensive care. In the Netherlands, virtually all 94 ICUs are mixed medical-surgical closed-format units, i.e., units with the intensivist as the patient's primary attending physician. The units are a mixture of academic, teaching, and nonteaching settings in urban and nonurban hospitals. In 2005, 8.4 adult ICU beds per 100,000 population were available, and 466 patients per 100,000 population were admitted to the ICU that year . Currently, a representative sample of 80 ICUs-covering 85% of all Dutch ICUs-voluntarily submit the limited core data set to the NICE registry, and 46 of them collect the complete, extended quality indicator data set.
At the NICE coordination center, dedicated data managers, software engineers, and a coordinator are responsible for routine processing, storing, checking, and reporting of the data. Also, for the duration of the study, two researchers will be available to provide the InFoQI program to ICUs in the intervention arm. The availability of these resources is essential for the feasibility of our study.
Selection of participants
All 46 ICUs that participate in NICE and (are preparing to) submit data to the registry on the extended quality indicator set will be invited to participate in our study. They should be willing and able to allocate at least two staff members for an average of four hours per month to be involved in the study. The medical manager of the ICU must sign a consent form to formalize the organization's commitment.
All patients admitted to participating ICUs during the study period will be included in the analyses. However, when evaluating the impact on patient outcomes, we will exclude admissions based on the Acute Physiology and Chronic Health Evaluation (APACHE) IV exclusion criteria , as well as admissions following cardiac surgery, patients who were dead on admission, and admissions with any of the case mix variables missing.
Control arm: basic feedback from the NICE registry
The ICUs allocated to the control arm will be treated as 'regular' NICE participants. This implies they will receive basic quarterly and annual feedback reports on the registry's core outcome indicators case-mix adjusted hospital mortality and length of ICU stay. In addition, they will be sent similar, but separate, basic quarterly and annual feedback reports containing data on the extended indicator set. Also, support by the NICE data managers is available and includes data quality audits, support with data collection, and additional data analyses on request. Furthermore, they are invited to a yearly discussion meeting where they can share experiences with other NICE participants.
Intervention arm: the InFoQI program
Elements of the InFoQI program (intervention arm)
• monthly report for monitoring ICU's performance over time
• comprehensive quarterly report for benchmarking ICU's performance to other
groups of ICUs
• sent to and discussed by QI team members
Local QI team
• responsible for formulating and executing a QI action plan
• monthly monitoring and discussing of performance using feedback reports
• sharing main findings with rest of ICU staff
Educational outreach visits
• on-site (1) at start of study period and (2) after six months
• all QI team members are present; visits guided by principal investigators
• promoting use of Plan-Do-Study-Act cycle for systematic quality improvement
• formulating and evaluating QI action plan based on performance data
From the prospective barriers analysis, it appeared that many barriers concerned the basic NICE feedback reports. To target the lack of case-mix correction and lack of information to initiate QI actions, the basic quarterly report will be replaced by an extended, comprehensive quarterly report that facilitates comparison of an ICU's performance with that of other ICUs, e.g., by providing the median length of ICU stay for elective surgery admissions in similar-sized ICUs as a benchmark. To increase the timeliness and intensity of reporting, we also developed a monthly report focusing on monitoring an ICUs' own performance over time to facilitate local evaluation of QI initiatives, e.g., by providing Statistical Process Control (SPC) charts . To decrease the level of data aggregation, both the monthly and quarterly reports contain data at the level of individual patients, e.g., a list of unexpected non-survivors (i.e., patients who died despite their low risk of mortality). The table in 'Additional file 2' summarizes the content of the reports.
ICUs in the intervention arm will establish a local QI team, creating a formal infrastructure at their department for systematic QI. This team must consist of at least one intensivist and one nurse; a management representative and a data manager are suggested as additional members. To target the lack of motivation to change, team members should be selected based on their affinity and experience with measuring and improving quality of care and their capability to convince their colleagues to be involved in QI activities. The team's main tasks are described in a protocol and include formulating a QI action plan, monitoring of performance using the feedback reports, and initiating and evaluating QI activities (see Table 1). We estimate the minimum time investment per team member to be four hours on average per month. This estimation takes into account all activities prescribed by the InFoQI program except for the execution of the QI plan. The actual time spent will depend on the type and number of QI actions in the plan.
Each ICU will receive two on-site educational outreach visits that are aimed at increasing trust in data quality, supporting the QI team members with interpreting their performance data, identifying opportunities for improvement, and translating them into a QI action plan. The structure of the visits will be equal for all intervention ICUs and the template for the action plan will be standardized. All visits will be facilitated by the same investigators who have a non-medical background; they have been involved in the development of the extended NVIC indicator set and have several years of experience with optimization of organizational processes at the ICU. Having non-clinicians supporting the QI team will make the intervention less intrusive, and therefore less threatening to participating units. It also increases the feasibility of the study, because clinical human resources are scarce in intensive care.
We used previously collected NICE data (regarding the year 2008) to select outcome measures from the extended quality indicator set to evaluate the effectiveness of our intervention. To decrease the probability of finding positive results by chance as a result of multiple hypothesis testing , we limited our primary endpoints to a combination of one patient outcome and one organizational process measure. We selected the indicators that showed the largest room for improvement, i.e., the largest difference between the average of top-performing centers and the average of the remaining centers .
Length of ICU stay (ICU LOS); this will be calculated as the difference in days between the time of ICU discharge and time of ICU admission. To account for patients being discharged too early, the length of stay of the first ICU admission will be prolonged with the length of stay of subsequent ICU readmissions within the same hospital admission.
Proportion of shifts with a bed occupancy rate above 80%; this threshold is set by the NVIC in their national organizational guideline for ICUs . We will calculate the bed occupancy rate as the maximum number of patients admitted simultaneously during an eight-hour nursing shift divided by the number of operational beds in that same shift. A bed will be defined as 'operational' when it is fitted with monitoring and ventilation equipment and scheduled nursing staff.
Secondary outcome measures will be all-cause, in-hospital mortality of ICU patients, duration of mechanical ventilation, proportion of glucose measurements outside the range of 2.2 to 8.0 mmol/L, and the proportion of shifts with a nurse-to-patient ratio below 0.5.
We will use the existing data collection methods as currently applied by the NICE registry . Most ICUs participating in NICE combine manual entry of data using dedicated software with automated data extractions from electronic patient records available in, e.g., their patient data management system. Each month, participants upload their data from the local, electronic database to the central, electronic registry database. ICUs in the intervention arm that have not submitted their data at the end of a month will be reminded by phone, and assisted if necessary. Quarterly reports are provided within ten weeks after the end of a period, and monthly reports within six weeks. The NICE registry uses a framework for data quality assurance , including elements like periodical on-site data quality audits and automated data range and consistency checks. For each ICU, additional data checks for completeness and accuracy will be performed before, during, and after the study period using descriptive statistics.
Sample size calculations
The minimally required number of ICUs participating in the trial was based on analysis of the NICE registry 2008 data. First, ICUs were ranked by average ICU LOS of their patients. The anticipated improvement was defined as the difference in average ICU LOS of the 33% top ranked ICUs (1.28 days) and average ICU LOS among the remaining ICUs (2.11 days), and amounted to a reduction of 0.58 days per patient. A senior intensivist confirmed that this reduction is considered clinically relevant. Assuming an average number of 343 admissions per ICU per year, calculations based on the normal distribution showed that we will need at least 26 ICUs completing the trial to detect this difference with 80% power at a type I error risk (α) of 5%, taking an estimated intra-cluster correlation of 0.036 into account. With this number of ICUs, the study will also be sufficiently powered to detect a reduction in mechanical ventilation duration of 0.75 days per patient (from 2.96 to 1.75 days). We do not expect to be able to detect an effect of the intervention on ICU or hospital mortality.
To determine the required sample size for bed occupancy, shifts with an occupancy exceeding 80% were counted. This occurred in 44% of all shifts in 2008. Following the same ranking procedure as described above, a reduction of 24% was anticipated, and considered clinically relevant. Power calculations based on the binomial distribution showed that we will need a minimum of 16 ICUs completing the trial to detect this difference, taking an estimated intra-cluster correlation of 0.278 into account.
For ICUs in the intervention group, the time from randomization to the first outreach visit-with an expected duration of six to eight weeks-will be regarded as a baseline period. Follow-up will end three months after the last report has been sent, assuming this is the average time required for an ICU to read, discuss, and act on a feedback report. The expected duration for intervention ICUs will therefore be approximately fourteen months. Control ICUs will have a fixed baseline period of two months, and a follow-up of fourteen months.
To assess the effect of the InFoQI program, the outcome values measured during the follow-up period will be compared between both study arms. To assess the effect of the program on length of stay, we will perform a survival analysis of time to alive ICU discharge with dying at the ICU as a competing risk , and adjusting for patient demographics, severity of illness during first 24 hours of admission, and admission type. To account for potential correlation of outcomes within ICUs, we will use generalized estimation equations with exchangeable correlation [34–36]. The same procedure will be used to analyze duration of mechanical ventilation. For all-cause mortality, logistic regression analysis will be used, adjusting for severity of illness at ICU admission by using the APACHE IV risk prediction model .
To assess the effect of the intervention on the proportion of shifts with a bed occupancy rate above 80%, shift-level occupancy data (0 for an occupancy rate below or equal to 80%, 1 for a rate above 80%) will be analyzed with logistic regression analysis. In this case, generalized estimation equations with an autoregressive correlation structure will be used to account for the longitudinal nature of shift occupancy observations. The same procedure will be followed to analyze the proportion of shifts with a nurse-to-patient ratio below 0.5.
To assess the effect on the proportion of out-of-range glucose measurements, multi-level logistic regression analysis will be performed where subsequent glucose measurements on the same patient are treated as time series data, and both patient-level and ICU-level intercept estimates are used to account for potential correlation of measurements within patients and within ICUs.
We will complement the quantitative trial results with the results from a process evaluation to gain insight into the barriers and success factors that affected the program's impact . We will determine the actual exposure to the InFoQI program by asking all members of the local QI teams to record the time they have invested in the different study activities. We will also investigate the experiences of those exposed, and evaluate which of the barriers identified before the start of the program were actually solved, and if any other unknown barriers affected the program's impact; this might include barriers at the facility level as well as at the individual level. Data will be collected by sending an electronic questionnaire to all QI team members at the end of the study period. They will be asked to rate on a 5-point Likert scale to what extent they perceived certain barriers to using the InFoQI program for quality improvement at their ICU. In addition, we will invite delegates of the local QI teams for a focus group to discuss in more detail their experiences with the InFoQI program and the barriers they perceived.
The Institutional Review Board (IRB) of the Academic Medical Center (Amsterdam, the Netherlands) informed us that formal IRB approval and patient consent was not deemed necessary due to the focus of the InFoQI program on improving organizational processes; individual patients will not be directly involved. Additionally, in the Netherlands there is no need to obtain consent to use data from registries that do not contain patient-identifying information, as is the case in the NICE registry. The NICE foundation is officially registered according to the Dutch Personal Data Protection Act.
This paper describes the protocol of a cluster randomized trial to evaluate the effect of the InFoQI program on the quality of ICU care and a qualitative process evaluation to gain insight into the barriers and success factors that affected the program's impact. The program-tailored to prospectively identified barriers and facilitators-consists of comprehensive feedback reports, establishing a local, multidisciplinary QI team, and educational outreach visits. We expect that this multifaceted intervention will improve the quality of ICU care by enabling ICUs to overcome known barriers to using performance data as input for local QI activities.
Strengths and weaknesses of the study design
In our study, we used the previously developed NVIC extended indicator set as the basis for our feedback intervention. Although the NVIC is the national organization representing the Dutch intensive care profession, some ICUs may still disagree with the relevancy of some of the indicators in the set. This would hinder the use of the feedback as input for local QI activities, potentially decreasing the effectiveness of the intervention. However, disagreement with the content of the indicator set was not identified as a barrier in our prospective barriers analysis. We will reassess this during the process evaluation.
Building on an existing indicator set also results in a clear strength of our study, because we are able to use the data collection methods as currently applied by the NICE registry. This will increase the feasibility of the InFoQI program, because eligible ICUs already routinely collect the necessary data items as a result of their participation in NICE; participation in the InFoQI program does not require additional data collection activities. Furthermore, the data quality assurance framework as applied by NICE increases the reliability of the data [31, 38], and all recommended data quality control methods for QI projects  are being accounted for in our study. This will minimize the probability of missing and erroneous data.
Unfortunately, the design of the study will not allow us to quantitatively evaluate the relative effectiveness of the individual components of the InFoQI program. We considered a factorial design  for a separate evaluation of the impact of the comprehensive feedback reports and the outreach visits. However, the strong interconnectedness between the two elements made this difficult. Furthermore, the program aims to successfully overcome known barriers to using performance feedback for improving practice. During the development process of the InFoQI program, it became apparent that in order to achieve this a combination of strategies would be required. Also, previous reviews of the literature reported that multifaceted interventions seem to be more effective than single interventions [15, 16, 41]. Therefore, we will primarily focus on evaluating the effectiveness of the program as a whole; yet, the process evaluation will provide us with qualitative information on how and to what extent each program element might have contributed to this effectiveness.
As for the participants in our study, only ICUs that participate in the NICE registry, are capable of submitting indicator data, and agree to allocate resources to establish a local QI team will be eligible for inclusion. These criteria may lead to the selection of a non-representative sample of ICUs, because eligible facilities are less likely to be understaffed and more likely to have information technology (IT) support to facilitate routine collection of NICE data. This will not affect the internal validity of our results, because both study arms will consist of these early adopters. Moreover, the 'earliest adopters'-i.e., the ICUs involved in the indicator pilot study -should be equally distributed between intervention and control group as a result of our stratification method. However, the generalizability of our findings will be limited to ICUs that are motivated and equipped to systematically monitor and improve the quality of the care they deliver. Nevertheless, as the number of ICUs participating in NICE is rapidly increasing, IT in hospitals is expanding, and applying QI principles is becoming more common in health care, we believe that this requirement will not reduce the relevancy of our results for future ICU practice.
Relation to other studies
The effectiveness of feedback as a QI strategy has often been evaluated, as indicated by the large number of included studies in systematic reviews on this subject [14, 15]. However, the number of studies comparing the effect of feedback alone with the effect of feedback combined with other strategies was limited and relatively few evaluations regarded the ICU domain [14, 42].
Previous before-after studies found a moderate effect of performance feedback  and of multidisciplinary QI teams  on the quality and costs of ICU care. However, many have advocated the need for rigorous evaluations using an external control group to evaluate the effect of QI initiatives [45–47], with the cluster randomized trial usually being the preferred method [48, 49]. There have been cluster RCTs in the ICU domain that evaluated a multifaceted intervention with audit and feedback as a basic element [50–52]. Some of them were highly successful in increasing adherence to a specific evidence-based treatment, such as the delivery of surfactant therapy to neonates  and semi-recumbent positioning to prevent ventilator-associated pneumonia . Our study will adopt a similar approach, combining feedback with other strategies to establish change. Nevertheless, the InFoQI program will not focus on promoting the uptake of one specific type of practice. Instead, we assume that: an ICU will be prompted to modify practice when they receive feedback on their performance being low or inconsistent with that of other ICUs; the members of the QI team are capable-with support of the facilitators-to formulate effective actions based on this feedback; and the resulting customized QI plan will contain QI activities that are considered important and feasible within the local context of the ICU. With the process evaluation, we will learn if these assumptions were correct.
Expected meaning of the study
The results of this study will inform ICU care providers and managers on the feasibility of a tailored multifaceted performance feedback intervention and its ability to accelerate systematic, local QI activities. However, the results will also be of interest to other settings where national quality registries including performance indicators are used for continuous monitoring and improving care. Furthermore, the quantitative effect measurement together with the qualitative data from the process evaluation will contribute to the knowledge on existing barriers to using indicators for improving the quality of care and how they can be effectively overcome.
NDK is director of the NICE registry. NDK and PVDV are members of the NICE board. PVDV is chairing the Netherlands Society of Intensive Care committee on quality indicators.
We thank all ICU clinicians and managers that provided input for the development of the intervention. We also acknowledge Eric van der Zwan and Winston Tjon Sjoe Sjoe for their technical assistance in developing the feedback reports.
- Langley GJ, Moen RD, Nolan KM, Nolan TW, Norman CL, Provost LP: The improvement guide: a practical approach to enhancing organizational performance. 2009, San Francisco: Jossey-Bass PublishersGoogle Scholar
- Berwick DM: Developing and testing changes in delivery of care. Annals of Internal Medicine. 1998, 128: 651-6.View ArticlePubMedGoogle Scholar
- Lilford R, Mohammed MA, Spiegelhalter D, Thomson R: Use and misuse of process and outcome data in managing performance of acute medical care: avoiding institutional stigma. The Lancet. 2004, 363: 1147-1154. 10.1016/S0140-6736(04)15901-1.View ArticleGoogle Scholar
- Donabedian A: Evaluating the quality of medical care. 1966. Milbank Q. 2005, 83: 691-729. 10.1111/j.1468-0009.2005.00397.x.View ArticlePubMedPubMed CentralGoogle Scholar
- Kastrup M, von D V, Seeling M, Ahlborn R, Tamarkin A, Conroy P, Boemke W, Wernecke KD, Spies C: Key performance indicators in intensive care medicine. A retrospective matched cohort study. J Int Med Res. 2009, 37: 1267-1284.View ArticlePubMedGoogle Scholar
- Berenholtz SM, Pronovost PJ, Ngo K, Barie PS, Hitt J, Kuti JL, Septimus E, Lawler N, Schilling L, Dorman T: Developing quality measures for sepsis care in the ICU. Jt Comm J Qual Patient Saf. 2007, 33: 559-568.PubMedGoogle Scholar
- De Vos M, Graafmans W, Keesman E, Westert G, Van der Voort P: Quality measurement at intensive care units: which indicators should we use?. Journal of Critical Care. 2007, 22: 267-74. 10.1016/j.jcrc.2007.01.002.View ArticlePubMedGoogle Scholar
- Martin MC, Cabre L, Ruiz J, Blanch L, Blanco J, Castillo F, Galdos P, Roca J, Saura RM: [Indicators of quality in the critical patient]. Med Intensiva. 2008, 32: 23-32. 10.1016/S0210-5691(08)70899-4.View ArticlePubMedGoogle Scholar
- Pronovost PJ, Berenholtz SM, Ngo K, McDowell M, Holzmueller C, Haraden C, Resar R, Rainey T, Nolan T, Dorman T: Developing and pilot testing quality indicators in the intensive care unit. J Crit Care. 2003, 18: 145-155. 10.1016/j.jcrc.2003.08.003.View ArticlePubMedGoogle Scholar
- Harrison DA, Brady AR, Rowan K: Case mix, outcome and length of stay for admissions to adult general critical care units in England, Wales and Northern Ireland: the Intensive Care National Audit & Research Centre Case Mix Programme Database. Critical Care. 2004, 8: R99-111. 10.1186/cc2834.View ArticlePubMedPubMed CentralGoogle Scholar
- Stow PJ, Hart GK, Higlett T, George C, Herkes R, McWilliam D, Bellomo R: Development and implementation of a high-quality clinical database: the Australian and New Zealand Intensive Care Society Adult Patient Database. Journal of Critical Care. 2006, 21: 133-41. 10.1016/j.jcrc.2005.11.010.View ArticlePubMedGoogle Scholar
- Cook SF, Visscher WA, Hobbs CL, Williams RL, the Project IMPACT Clinical Implementation Committee: Project IMPACT: Results from a pilot validity study of a new observational database. Critical Care Medicine. 2002, 30: 2765-70. 10.1097/00003246-200212000-00024.View ArticlePubMedGoogle Scholar
- Bakshi-Raiez F, Peek N, Bosman RJ, De Jonge E, De Keizer NF: The impact of different prognostic models and their customization on institutional comparison of intensive care units. Critical Care Medicine. 2007, 35: 2553-60. 10.1097/01.CCM.0000288123.29559.5A.View ArticleGoogle Scholar
- Jamtvedt G, Young JM, Kristoffersen DT, O'Brien MA, Oxman AD: Audit and feedback: effects on professional practice and health care outcomes. Cochrane Database Syst Rev. 2006, CD000259-2Google Scholar
- Van der Veer SN, De Keizer NF, Ravelli ACJ, Tenkink S, Jager KJ: Improving quality of care. A systematic review on how medical registries provide information feedback to health care providers. International Journal for Medical Informatics. 2010, 79: 305-23. 10.1016/j.ijmedinf.2010.01.011.View ArticleGoogle Scholar
- De Vos M, Graafmans W, Kooistra M, Meijboom B, Van der Voort P, Westert G: Using quality indicators to improve hospital care: a review of the literature. International Journal for Quality in Health Care. 2009, 21: 119-29. 10.1093/intqhc/mzn059.View ArticlePubMedGoogle Scholar
- De Vos M, Van der Veer SN, Graafmans W, De Keizer NF, Jager KJ, Westert G, Van der Voort P: Implementing quality indicators in ICUs: exploring barriers to and facilitators of behaviour change. Implementation Science. 2010, 5: 52-10.1186/1748-5908-5-52.View ArticlePubMedPubMed CentralGoogle Scholar
- Bosch M, van der Weijden T, Wensing M, Grol R: Tailoring quality improvement interventions to identified barriers: a multiple case analysis. Journal of Evaluation in Clinical Practice. 2007, 13: 161-168. 10.1111/j.1365-2753.2006.00660.x.View ArticlePubMedGoogle Scholar
- Van Bokhoven MA, Kok G, Van der Weijden T: Designing a quality improvement intervention: a systematic approach. Quality & Safety in Health Care. 2003, 12: 215-20. 10.1136/qhc.12.3.215.View ArticleGoogle Scholar
- Ukoumunne OC, Gulliford MC, Chinn S, Sterne JA, Burney PG, Donner A: Methods in health service research. Evaluation of health interventions at area and organisation level. BMJ. 1999, 319: 376-379. 10.1136/bmj.319.7206.376.View ArticlePubMedPubMed CentralGoogle Scholar
- Thorpe KE, Zwarenstein M, Oxman AD, Treweek S, Furberg CD, Altman DG, Tunis S, Bergel E, Harvey I, Magid DJ: A pragmatic-explanatory continuum indicator summary (PRECIS): a tool to help trial designers. J Clin Epidemiol. 2009, 62: 464-475. 10.1016/j.jclinepi.2008.12.011.View ArticlePubMedGoogle Scholar
- Moher D, Hopewell S, Schulz KF, Montori V, Gotzsche PC, Devereaux PJ, Elbourne D, Egger M, Altman DG: CONSORT 2010 explanation and elaboration: updated guidelines for reporting parallel group randomised trials. BMJ. 2010, 340: c869-10.1136/bmj.c869.View ArticlePubMedPubMed CentralGoogle Scholar
- Campbell MK, Elbourne DR, Altman DG: CONSORT statement: extension to cluster randomised trials. BMJ. 2004, 328: 702-708. 10.1136/bmj.328.7441.702.View ArticlePubMedPubMed CentralGoogle Scholar
- Zwarenstein M, Treweek S, Gagnier JJ, Altman DG, Tunis S, Haynes B, Oxman AD, Moher D: Improving the reporting of pragmatic trials: an extension of the CONSORT statement. BMJ. 2008, 337: a2390-10.1136/bmj.a2390.View ArticlePubMedPubMed CentralGoogle Scholar
- Wunsch H, Angus DC, Harrison DA, Collange O, Fowler R, Hoste EA, de Keizer NF, Kersten A, Linde-Zwirble WT, Sandiumenge A: Variation in critical care services across North America and Western Europe. Crit Care Med. 2008, 36: 2787-2789. 10.1097/CCM.0b013e318186aec8.View ArticlePubMedGoogle Scholar
- Zimmerman JE, Kramer AA, McNair DS, Malila FM: Acute Physiology and Chronic Health Evaluation (APACHE) IV: hospital mortality assessment for today's critically ill patients. Crit Care Med. 2006, 34: 1297-1310. 10.1097/01.CCM.0000215112.84523.F0.View ArticlePubMedGoogle Scholar
- Benneyan JC, Lloyd RC, Plsek PE: Statistical process control as a tool for research and healthcare improvement. Qual Saf Health Care. 2003, 12: 458-64. 10.1136/qhc.12.6.458.View ArticlePubMedPubMed CentralGoogle Scholar
- Guyatt G, Jaeschke R, Heddle N, Cook D, Shannon H, Walter S: Basic statistics for clinicians: 1. Hypothesis testing. CMAJ. 1995, 152: 27-32.PubMedPubMed CentralGoogle Scholar
- Kiefe CI, Allison JJ, Williams OD, Person SD, Weaver MT, Weissman NW: Improving quality improvement using achievable benchmarks for physician feedback: a randomized controlled trial. JAMA. 2001, 285: 2871-2879. 10.1001/jama.285.22.2871.View ArticlePubMedGoogle Scholar
- Netherlands Society for Anesthesiology: Richtlijn Organisatie en werkwijze op intensive care-afdelingen voor volwassenen in Nederland [Guideline Organisation and working processes of ICUs for adults in the Netherlands]. 2006, Alphen aan den Rijn, the Netherlands: Van Zuiden Communications B.VGoogle Scholar
- Arts D, de KN, Scheffer GJ, de JE: Quality of data collected for severity of illness scores in the Dutch National Intensive Care Evaluation (NICE) registry. Intensive Care Med. 2002, 28: 656-659. 10.1007/s00134-002-1272-z.View ArticlePubMedGoogle Scholar
- Arts DG, De Keizer NF, Scheffer GJ: Defining and improving data quality in medical registries: a literature review, case study, and generic framework. J Am Med Inform Assoc. 2002, 9: 600-611. 10.1197/jamia.M1087.View ArticlePubMedPubMed CentralGoogle Scholar
- Putter H, Fiocco M, Geskus RB: Tutorial in biostatistics: competing risks and multi-state models. Stat Med. 2007, 26: 2389-2430. 10.1002/sim.2712.View ArticlePubMedGoogle Scholar
- Logan BR, Zhang MJ, Klein JP: Marginal models for clustered time-to-event data with competing risks using pseudovalues. Biometrics. 2011, 67: 1-7. 10.1111/j.1541-0420.2010.01416.x.View ArticlePubMedPubMed CentralGoogle Scholar
- Donner A, Klar N: Design and analysis of cluster randomization trials in health research. 2000, London: ArnoldGoogle Scholar
- Zeger SL, Liang KY: Longitudinal data analysis for discrete and continuous outcomes. Biometrics. 1986, 42: 121-130. 10.2307/2531248.View ArticlePubMedGoogle Scholar
- Hulscher ME, Laurant MG, Grol RP: Process evaluation on quality improvement interventions. Qual Saf Health Care. 2003, 12: 40-46. 10.1136/qhc.12.1.40.View ArticlePubMedPubMed CentralGoogle Scholar
- Arts DG, Bosman RJ, de JE, Joore JC, de Keizer NF: Training in data definitions improves quality of intensive care data. Crit Care. 2003, 7: 179-184. 10.1186/cc1886.View ArticlePubMedPubMed CentralGoogle Scholar
- Needham DM, Sinopoli DJ, Dinglas VD, Berenholtz SM, Korupolu R, Watson SR, Lubomski L, Goeschel C, Pronovost PJ: Improving data quality control in quality improvement projects. Int J Qual Health Care. 2009, 21: 145-150. 10.1093/intqhc/mzp005.View ArticlePubMedPubMed CentralGoogle Scholar
- Montgomery AA, Peters TJ, Little P: Design, analysis and presentation of factorial randomised controlled trials. BMC Med Res Methodol. 2003, 3: 26-10.1186/1471-2288-3-26.View ArticlePubMedPubMed CentralGoogle Scholar
- Bero LA, Grilli R, Grimshaw JM, Harvey E, Oxman AD, Thomson MA: Closing the gap between research and practice: an overview of systematic reviews of interventions to promote the implementation of research findings. The Cochrane Effective Practice and Organization of Care Review Group. BMJ. 1998, 317: 465-468. 10.1136/bmj.317.7156.465.View ArticlePubMedPubMed CentralGoogle Scholar
- Foy R, Eccles MP, Jamtvedt G, Young J, Grimshaw JM, Baker R: What do we know about how to do audit and feedback? Pitfalls in applying evidence from a systematic review. BMC Health Serv Res. 2005, 5: 50-10.1186/1472-6963-5-50.View ArticlePubMedPubMed CentralGoogle Scholar
- Eagle KA, Mulley AG, Skates SJ, Reder VA, Nicholson BW, Sexton JO, Barnett GO, Thibault GE: Length of stay in the intensive care unit. Effects of practice guidelines and feedback. JAMA. 1990, 264: 992-997. 10.1001/jama.264.8.992.View ArticlePubMedGoogle Scholar
- Clemmer TP, Spuhler VJ, Oniki TA, Horn SD: Results of a collaborative quality improvement program on outcomes and costs in a tertiary critical care unit. Crit Care Med. 1999, 27: 1768-1774. 10.1097/00003246-199909000-00011.View ArticlePubMedGoogle Scholar
- Berenholtz S, Needham DM, Lubomski LH, Goeschel CA, Pronovost P: Improving the quality of quality improvement projects. The Joint Commission Journal on Quality and Patient Safety. 2010, 36: 468-73.PubMedGoogle Scholar
- Auerbach AD, Landefeld CS, Shojania KG: The tension between needing to improve care and knowing how to do it. N Engl J Med. 2007, 357: 608-613. 10.1056/NEJMsb070738.View ArticlePubMedGoogle Scholar
- Shojania KG, Grimshaw JM: Evidence-based quality improvement: the state of the science. Health Aff (Millwood ). 2005, 24: 138-150. 10.1377/hlthaff.24.1.138.View ArticleGoogle Scholar
- Chuang JH, Hripcsak G, Heitjan DF: Design and analysis of controlled trials in naturally clustered environments: implications for medical informatics. J Am Med Inform Assoc. 2002, 9: 230-238. 10.1197/jamia.M0997.View ArticlePubMedPubMed CentralGoogle Scholar
- Eccles M, Grimshaw JM, Campbell M, Ramsay C: Research designs for studies evaluating the effectiveness of change and improvement strategies. Qual Saf Health Care. 2003, 12: 47-52. 10.1136/qhc.12.1.47.View ArticlePubMedPubMed CentralGoogle Scholar
- Scales DC, Dainty K, Hales B, Pinto R, Fowler RA, Adhikari NK, Zwarenstein M: A multifaceted intervention for quality improvement in a network of intensive care units: a cluster randomized trial. JAMA. 2011, 305: 363-372. 10.1001/jama.2010.2000.View ArticlePubMedGoogle Scholar
- Horbar JD, Carpenter JH, Buzas J, Soll RF, Suresh G, Bracken MB, Leviton LC, Plsek PE, Sinclair JC: Collaborative quality improvement to promote evidence based surfactant for preterm infants: a cluster randomised trial. BMJ. 2004, 329: 1004-10.1136/bmj.329.7473.1004.View ArticlePubMedPubMed CentralGoogle Scholar
- Hendryx MS, Fieselmann JF, Bock J, Wakefield DS, Helms CM, Bentler SE: Outreach education to improve quality of rural ICU care. Am J Respir Crit Care Med. 1998, 158: 418-23.View ArticlePubMedGoogle Scholar
This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.