Table 1

Characteristics of scales and items in the questionnaire
Scale/item # items Cronbach’s α/Pearson’s coefficient (r) Examples of items, answer categories and score range
Outcomes
Child’s snacking behaviour 4 - How many days a week does your child eat snacks (crisps, cheese cubes etcetera or sweets)? Never (0) – every day (7). How many portions (crisps, cheese cubes etcetera or sweets) does your child eat per day? 1-2 portions a day (1) – more than 4 portions a day (3)
Child’s outdoors playing 2 - How many days a week does your child play outdoors (outside school time) Never (0) – every day (7). How long does your child generally play outdoors? Less than half an hour per day (1) – more than 3 hours per day (5).
Intention snack intake 1 - For the next six months, I plan to make sure my child does not eat too many sweets and snacks. Certainly not (-2) – certainly (2)a
Intention playing outdoors 1 - Do you plan to be alert to see that your child plays outdoors enough to prevent or diminish overweight in the next six months? Certainly not (-2) – certainly (2)
Distal factors
Beliefs about genetic causes of overweight 8 α =0.75 A person’s physique is hereditary. Totally disagree (-2) – totally agree (2)
Perceived child weight 2 r = 0.83 What do you think of your child’s weight at this moment? Compared to other children of his/her age, I find my child…. Far too heavy (-2) – far too light (2)
Monitoring (CFQ)b 3 α = 0.91 How much do you keep track of the sweets (candy, ice cream, cream cake) that your child eats? Never (-2) – Always (2)
TPB factors
Attitude snack intake 6 α = 0.61 I think it’s alright to watch my child at all time so he/she does not eat too many sweets and snacks. Totally disagree (-2) – totally agree (2)
Subjective social norm snack intake 3 α = 0.85 My partner thinks that I should be alert and see that my child does not eat too many candies and snacks. Certainly not (-2) – certainly (2)
Perceived behavioural control snack intake 2 r = 0.42 Do you think that you will succeed in continuing to watch your child so he/she does not eat too many sweets and snacks if he/she keeps asking for snacks. Certainly not (-2) - certainly (2)
Attitude playing outdoors 6 α = 0.45 If I make sure my child plays outdoors enough, he/she will not become/be less overweight. Totally disagree (-2) – totally agree (2)
Subjective social norm playing outdoors 3 α = 0.91 My parents think that I should be alert and make sure my child plays outdoors enough. Certainly not (-2) – certainly (2)
Perceived behavioural control playing outdoors 2 r = 0.50 Do you think that you will succeed in getting your child to play outdoors enough if he/she wants to watch TV and he/she keeps on at you? Certainly not (-2) - certainly (2)

a The response categories of TPB-items, and the items of the scales perceived child weight and beliefs about genetic causes of overweight, comprised five options with a neutral option in the middle, except for attitude items which had ‘slightly agree’ as middle response option.

bSubscale of Child Feeding Questionnaire (CFQ) [33].

Kocken et al.

Kocken et al. BMC Public Health 2012 12:867   doi:10.1186/1471-2458-12-867

Open Data