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