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 3 Relationship between fidelity predictors and the nutritional status of intervention participants

Fixed Effects	β	95% Confidence interval		p
Fixed Effects	β	Lower	Upper	p
Adherence
Study-specific checklist
Reasons for RT	−1.16	−6.96	4.64	0.69
Eating as integral to radiotherapy	0.93	−4.79	6.64	0.748
Nutrition plan	7.62	0.65	14.58	0.032
Review plan	−8.37	−23.88	7.15	0.287
Validated nutrition assessment	−2.93	−10.95	5.07	0.468
Adequacy of intake	7.15	−15.73	30.04	0.536
Behaviour Change Counselling Index
Overall Practitioner Score	0.69	0.02	1.38	0.045
‘Spirit’ of intervention delivery
CTS-R interpersonal effectiveness score	−1.98	−7.46	3.50	0.476
Competence
CTS-R application of behaviour change counselling item	3.50	0.47	6.53	0.024

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