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Table 3 Scales and included items

From: Development and evaluation of social cognitive measures related to adolescent dietary behaviors

Self-efficacy scale
Circle ONE option to indicate how much you agree or disagree with each statement. Whenever I have a choice of the food I eat…
  Strongly Disagree Disagree Disagree Slightly Agree Slightly Agree Strongly Agree
1. I find it difficult to choose low-fat foods (e.g. fruit or “lite” milk rather than “full cream” milk). SD D DS AS A SA
2. I find it easy to choose a healthy snack when I eat in between meals (e.g. fruit or reduced-fat yoghurt). SD D DS AS A SA
3. I believe I have the knowledge and ability to choose/prepare healthy snacks. SD D DS AS A SA
4. I find it difficult to choose healthy meals/ snacks when I am eating out with my friends. SD D DS AS A SA
5. I find it easy to eat at least 3 servings of fruit each day. SD D DS AS A SA
6. I find it easy to eat at least 4 servings of vegetables/ salad each day. SD D DS AS A SA
7. I find it easy to have healthy portion sizes during meals (e.g. not eating till I feel full). SD D DS AS A SA
Intentions scale
Please tick () - In the next THREE MONTHS do you…
  Not at all true of me Not very true of me Somewhat true of me Very true of me
1. INTEND to eat at least 3 servings of fruit each day?
2. INTEND to eat at least 4 servings of vegetables/ salad each day?
3. INTEND to choose low-fat foods and drinks whenever you have a choice?
4. INTEND to choose drinks and foods that are low in added sugar whenever you have a choice?
5. INTEND to eat healthier portion sizes during meals (e.g. not eating till you feel full)?
Situation scale
Circle ONE option to indicate how much you agree or disagree with each statement:
  Strongly disagree Disagree Disagree slightly Agree slightly Agree Strongly agree
1. At home there are healthy snacks available to eat. SD D DS AS A SA
2. At home there are healthy drinks available (e.g. cold water in the fridge, sugar-free drinks, reduced-fat milk). SD D DS AS A SA
3. At home fruit is always available to eat (including fresh, canned or dried fruit). SD D DS AS A SA
4. At home vegetables are always available to eat (including fresh, frozen or canned vegetables). SD D DS AS A SA
Behavioral strategies scale
Circle ONE option for each question. In the past THREE MONTHS…
  Never Rarely Sometimes Often Always
1. …did you choose reduced-fat options when they were available (e.g. “lite” milk, reduced-fat cheese and yoghurt)? N R S O A
2. …rather than choose sugary drinks such as fruit juice or soft drink, did you choose water or sugar-free drinks such as diet soft drink? N R S O A
3. …did you leave food on your plate once you felt full during a meal? N R S O A
4. …did you prepare healthy snacks and meals for yourself that were that were low in fat and low in added sugar? N R S O A
5. …did you try preparing new recipes for meals and snacks that were low in fat and low in added sugar? N R S O A
6. …did you do things to make eating fruits and vegetables more enjoyable (e.g. try a new recipe or blend fruit to make a fruit smoothie)? N R S O A
Social support scale
Circle ONE option for each question. In the past THREE MONTHS how often…
  Never Rarely Sometimes Often Always
1. …were fruit and vegetables available at home? N R S O A
2. …did your parents/caretaker make healthy snacks available (e.g. fruit or reduced-fat yoghurt)? N R S O A
3. …did your parents/caretaker prepare a healthy home-cooked dinner for you? N R S O A
4. …did your parents/caretaker encourage you to eat fruits and vegetables? N R S O A
5. …did you prepare healthy snacks or meals with your parents/caretaker? N R S O A
Outcome expectations and expectancies scale
Please tick () ONE option to indicate how much you agree or disagree with each benefit and how important each benefit is to you:
1a. Healthy eating can reduce my risk for some illnesses and diseases (e.g. heart disease, diabetes, some cancers etc).
Strongly Disagree Disagree Partly Disagree Partly Agree Agree Strongly Agree
1b. How important is reducing your risk for illness and disease to you?
Not at all important Only slightly important Important Extremely Important
2a. Healthy eating can help me to feel better physically.
Strongly Disagree Disagree Partly Disagree Partly Agree Agree Strongly Agree
2b. How important is feeling better physically to you?
Not at all important Only slightly important Important Extremely Important
3a. Healthy eating can help me to control my weight.
Strongly Disagree Disagree Partly Disagree Partly Agree Agree Strongly Agree
3b. How important is controlling your weight to you?
Not at all important Only slightly important Important Extremely Important
4a. Healthy eating (e.g. not skipping meals) can help to improve my concentration at school.
Strongly Disagree Disagree Partly Disagree Partly Agree Agree Strongly Agree
4b. How important is improving your concentration at school to you?
Not at all important Only slightly important Important Extremely Important
5a. Healthy eating can help me to feel more energetic throughout the day
Strongly Disagree Disagree Partly Disagree Partly Agree Agree Strongly Agree
5b. How important is feeling more energetic to you?
Not at all important Only slightly important Important Extremely Important