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Table 1 Questionnaire items, response alternatives, and reliability coefficients (test-retest correlation and internal consistency reliability) of fruit and vegetable intake and the SCT variables assessed in the FVMM study.

From: Changes in accessibility and preferences predict children's future fruit and vegetable intake

Scale Response Possible scale range Test-retest correlation (14 days in between)** Internal consistency reliability***
Intake (times/week)   0/40 0.75 NA
How often do you eat:
1. Vegetables for dinner?
2. Vegetables on bread?*
3. Other vegetables (e.g. carrot for school lunch)?
4. Apple, orange, pear or banana?
5. Other fruits or berries?
Ten alternatives: Never (0), less than once a week (0.5), once a week (1) to every day (7), several times a day (10). Question 3 did not count in the scale.*    
Accessibility at home   -10/10 0.66 0.49
1. At home we usually always have fruits and vegetables in the refrigerator
2. At home I am allowed to eat fruits and vegetables whenever I want
3. Mother or father do sometimes cut up fruits or vegetables for me as a snack
4. At home we usually have vegetables at dinner every day
5. At home we usually have fruits available in a (fruit-) bowl
Five alternatives: I fully disagree (-2), I disagree (-1), I do not agree nor disagree (0), I agree (1), I fully agree (2)    
Accessibility at school   0/1 No data NA
1. Do you subscribe to the School Fruit Programme? Yes (1), no (0).    
Modelling   -8/8 0.70 0.46
1. My mother eats lots of fruits and vegetables
2. My father eats lots of fruits and vegetables
3. Many of my friends and siblings eat lots of fruits and vegetables
4. My home-economy teacher eats lots of fruits and vegetables
Five alternatives: I fully disagree (-2) to I fully agree (2)    
Intention (to eat 5-a-day)   -2/2 0.51 NA
1. I intend to eat at least 5 servings of fruits and vegetables every day Five alternatives: I fully disagree (-2) to I fully agree (2)    
Preferences   -8/8 0.74 0.68
1. Fruits and vegetables make my meals taste better
2. I really like raw vegetables
3. Fruits are among the best [foods] I know
4. Fruits and vegetables are very suitable as snacks
Five alternatives: I fully disagree (-2) to I fully agree (2)    
Self-Efficacy (to eat 5-a-day)   -6/6 0.61 0.44
1. For me, it would be easy to eat fruits or vegetables to every meal, every day, if I decided to do so
2. For, me it would be easy to eat fruits or vegetables on Saturday evenings, even if everybody else are eating snacks
3. For me, it would be easy to eat more than 5 servings of fruits and vegetables every day
Five alternatives: I fully disagree (-2) to I fully agree (2)    
Awareness (of 5-a-day)   0/6 No data NA
1. How many servings of fruit and vegetables should a person at your age eat every day? Seven alternatives: None (0), 1-a-day (1) to 5-a-day(5), more than 5-a-day (6)    
  1. * Some Norwegians have vegetables on their sandwiches, but usually in small amounts. Therefore, this question was not included in the intake scale. The question was included in the questionnaire so that the participants should not include their vegetables on bread in the 'other vegetables' question.
  2. ** Intake: Spearman's r From Andersen and colleagues [11], all other scales: Pearson's r from Bere and Klepp [12].
  3. *** Cronbach's alpha: From Bere and colleagues [6].
  4. NA = not applicable
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