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Feasibility of recruitment, retention, and data completion (both chiropractors and patients)
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Recruitment and retention rates, missing data
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Descriptive statistics: mean and SD for continuous variables and proportions for categorical variables
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Chiropractor process outcomes
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Adherence rate
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Single indicators
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Continuous data (number of DCs adhering to the intervention per number of eligible participants)
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Composite
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Count of indicators reaching “success” threshold
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Behavioural
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Level of knowledge and self-efficacy
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5-point Likert scale (from 1 = strongly agree to 5 = strongly disagree), ordinal
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Patient health outcomes
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Pain
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Visual analogue scale
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Self-rated level of pain on 11 points, continuous
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Disability
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Neck Disability Index
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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
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Satisfaction with care
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Questionnaire
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Self-rated satisfaction with care measured on the short-form questionnaire rated on a 5-point Likert scale from “very satisfied” to very “dissatisfied”
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Potential efficacy
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Post-intervention between groups
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Normal approximation to the binomial
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