Table 4.

Statistical analysis

Construct	Measure	Measurement scale
Feasibility of recruitment, retention, and data completion (both chiropractors and patients)	Recruitment and retention rates, missing data	Descriptive statistics: mean and SD for continuous variables and proportions for categorical variables
Chiropractor process outcomes
Adherence rate	Single indicators	Continuous data (number of DCs adhering to the intervention per number of eligible participants)
	Composite	Count of indicators reaching “success” threshold
Behavioural	Level of knowledge and self-efficacy	5-point Likert scale (from 1 = strongly agree to 5 = strongly disagree), ordinal
Patient health outcomes
Pain	Visual analogue scale	Self-rated level of pain on 11 points, continuous
Disability	Neck Disability Index	Scale range and subscales: 10 items in total; each item is scored from 0 to 5 (“0” = no disability and “5” = full disability) for a total of 50
Satisfaction with care	Questionnaire	Self-rated satisfaction with care measured on the short-form questionnaire rated on a 5-point Likert scale from “very satisfied” to very “dissatisfied”
Potential efficacy	Post-intervention between groups	Normal approximation to the binomial