Is fidelity to a complex behaviour change intervention associated with patient outcomes? Exploring the relationship between dietitian adherence and competence and the nutritional status of intervention patients in a successful stepped-wedge randomised clinical trial of eating as treatment (EAT)

Table 2 Average adherence and competence ratings for dietitians (n=20) whose consultations (n=194) with intervention patients (n=107) were sampled for fidelity analysis

	Proportion or M (SD)	Range
Adherence
Study-specific checklist
Reasons for RT	0.22	0 to 1.0
Eating as integral to radiotherapy	0.46	0 to 1.0
Nutrition plan	0.27	0 to 0.85
Review plan	0.13	0 to 0.50
Validated nutrition assessment	0.73	0.53 to 1.0
Adequacy of intake	0.96	0.80 to 1.0
Behaviour Change Counselling Index
Overall Practitioner Score	23.17 (2.39)	17.52 to 27.45
‘Spirit’ of intervention delivery
CTS-R Interpersonal Effectiveness Score	5.65 (0.55)	4.20 to 6.00
Competence
CTS-R application of behaviour change counselling item	2.63 (0.61)	1.10 to 3.60

ISSN: 1748-5908