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Table 2 K-DPP implementation evaluation measures, data sources and their calculations

From: A group-based lifestyle intervention for diabetes prevention in low- and middle-income country: implementation evaluation of the Kerala Diabetes Prevention Program

Evaluation measures Description Data sources Collected by Time points Data analysis
Provider-level factors
 Penetration Penetration into the target population Recruitment records Intervention team At the beginning of the program Numerator: # of individuals approached or invited to engage in the program
Denominator: # of individuals in the target population
 Implementation Delivery of intervention components and adherence to intervention protocol Peer-leader training evaluation questionnaire, attendance sheet and group session reports completed by peer leaders Peer leaders; and/or intervention team (for attendance) Training evaluation at the end of the training;
Attendance record during each session; and
Group session reports at the end of each session
Assessment of intervention components (peer leader training, group sessions, resource material and ongoing support) to ascertain their delivery as planned
 Adoption Provider-level (setting-level) participation Group session reports completed by peer leaders Peer leaders At the end of each session Numerator: # of polling areas enrolled in the program
Denominator: total number of polling areas randomly selected for inclusion in the program, at the beginning of the program
 Facilitators and barriers Provider-level facilitators and barriers Group session reports completed by peer leaders Peer leaders At the end of each session Assessment of facilitators and barriers to intervention delivery
Participant-level factors
 Reach Proportion of eligible individuals enrolled in the program Recruitment records Intervention team At the beginning of the program Numerator: # of participants enrolled in the program
Denominator: # of eligible individuals
 Participation Participants’ attendance in the program Attendance sheet/recruitment records Peer leaders and/or intervention team During each session Average attendance in 15 group-based sessions
Participants’ retention in the program As needed Numerator: # of participants who provided measurements at 12-months
Denominator: # of participants enrolled in the program
 Effectiveness Effectiveness according to primary and secondary outcomes Clinical measurements records Intervention team At baseline, 12 months and 24 months Numerator: # of participants who developed diabetes at 24 months
Denominator: # of individuals who provided measurements at 24 months
Changes in clinical and behavioural characteristics from baseline to 12 and/or 24 months.
 Adoption Participation in goal setting for behaviour change Intervention participants evaluation questionnaire Intervention participants At 12 months Numerator: # of participants who made change(s) to their lifestyle to meet their goals
Denominator: # of participants who set goals for behaviour change
Numerator: # of participants who were willing to adhere to the lifestyle change after the intervention
Denominator: # of participants who made lifestyle change(s)
Utilisation of diabetes education resource materials Numerator: # of participants who utilised the diabetes education resource materials
Denominator: # of participants who received the diabetes education resource materials
Participants’ satisfaction with the program Participants’ satisfaction with the peer-led groups based on a series of questions asked at the end of 12-months
 Evaluation of control participants Evaluation of control participants at 12-months Control participants evaluation questionnaire Control participants At 12 months Participant’s use of health information booklet and behaviour changes made by participants over the duration of the intervention
 Facilitators and barriers Participant-level facilitators and barriers Intervention participants evaluation questionnaire Intervention participants At 12 months Assessment of facilitators and barriers to participate in the program
Community-level factors
 Community activities Participation in community activities outside group sessions Intervention participants evaluation questionnaire Intervention participants At 12 months Numerator: # of participants who took part in community activities
Denominator: # of participants enrolled in the program
 Community support Frequency of additional contacts between peer leader and group member and among group members outside the group sessions Intervention participants evaluation questionnaire Intervention participants At 12 months Numerator: # of participants who contacted their peer leaders/group members outside the group sessions
Denominator: # of participants enrolled in the program
An average number of contacts made during the intervention.
Support received during the intervention period from sources other than K-DPP Numerator: # of participants who received support from other community sources
Denominator: # of participants enrolled in the program
 Facilitators and barriers Community-level facilitators and barriers to participation and/or intervention delivery Ongoing interactions between peer leaders and the K-DPP intervention team including telephone calls and face-to-face meetings
Group session reports completed by peer leaders
Intervention team Ongoing Assessment of community-level facilitators and barriers