Table 1 Variables from the ProjectADAPT study classified as determinants using Michie’s Behavour Change Wheel Capability, Opportunity, Motivation and Behaviour (COM-B) model
Source of behaviour (COM-B) | Theoretical domain framework (COM-B) | Determinant | Survey items | Response options |
|---|---|---|---|---|
Capability – Physical | Physical skills | Food-related activities and skills (5 questionnaire items) | How many times in the past month did you (1) shop for food, or help shop for food, for your household; (2) plan ahead what you would eat at meals at home; (3) make a grocery shopping list for your household; (4) prepare a meal for your household on your own; (5) help to prepare a meal for your household. | Never/rarely; less than once/week; once/week; about 2–3 times/week; about 4–6 times/week; every day |
Opportunity - Physical | Environmental context and resources | Availability of healthy food (2 questionnaire items) | How often (1) is fruit available in your home; (2) are vegetables available in your home | Sometimes; usually; always. |
Motivation - Reflective | Beliefs about capabilities | Self-efficacy (6 questionnaire items) | How confident are you that you could eat healthy foods when you are (1) at the shops; (2) hungry after school or work; (3) with your friends; (4) feeling down, bored or stressed; (5) eating out; or (6) alone | Not at all; slightly; moderately; very; extremely |