Table 1 Exact description of the mediators used in the study and test-retest reliability, if available
Constructs with items | Response categories | Test-retest reliability (ICC) |
|---|---|---|
PERSONAL | Â | Â |
Liking | Â | Â |
I like to eat fruit/vegetables every day | 5-point scale from 2 = 1 I fully agree to -2 = I fully disagree | Fruit: ICC = 0.74 |
Fruit/vegetables taste good | Â | Vegetable: ICC = 0.77 |
Knowledge fruit | Â | Â |
How much fruit do you think you should eat to have a healthy diet? | 1 = no fruit, 2 = 1-3 pieces per week, 3 = 4-6 pieces per week, 4 = 1 piece per day, 5 = 2 pieces per day, 6 = 3 pieces per day, 7 = 4 pieces per day, 8 = 5 pieces per day or more; Recoded: correct knowledge = (5-8) = 1, incorrect (1-5) = 0 | ICC = 0.52 |
Knowledge vegetables | Â | Â |
How many vegetables do you think you should eat to have a healthy diet? | 1 = no vegetables, 2 = 1-3 portions (serving spoons) per week, 3 = 4-6 portions per week, 4 = 1 portion every day, 5 = 2 portions every day, 6 = 3 portions every day, 7 = 4 portions every day, 8 = 5 or more portions every day; Recoded: correct knowledge = 6-8 | ICC = 0.61 |
Perceived social environmental | Â | Â |
Active encouragement | Â | Â |
My mother encourages me to eat fruit/vegetables every day | 5-point scale from 2 = 1 I fully agree to -2 = I fully disagree | Fruit: ICC = 0.73 |
My father encourages me to eat fruit/vegetables every day | Â | Vegetable: ICC = 0.64 |
Parental demand | Â | Â |
Do your parents demand that you eat fruit/vegetables every day? | 5-point scale from 2 = yes, always to -2 = never | Fruit: ICC = 0.68 |
| Â | Â | Vegetable: ICC = 0.71 |
Parental allowing | Â | Â |
Are you allowed to eat as much fruit/vegetables as you like at home? | 5-point scale from 2 = yes, always to -2 = never | Fruit: ICC = 0.50 Vegetable: ICC = 0.59 |
Facilitating | Â | Â |
Does your mother or father usually cut up fruit/vegetables for you in between meals? | 5-point scale from 2 = yes, always to -2 = never | Â |
Perceived physical environment | Â | Â |
School availability | Â | Â |
Can you get fruit/vegetables at school either by buying it or getting it for free? | 5-point scale from 2 = yes, always to -2 = never | Â |
Bringing to school | Â | Â |
Do you usually bring fruit/vegetables with you to school? | 5-point scale from 2 = yes, always to -2 = never | Â |