Table 2 Outcome measures: questionnaire wording, response options and binary aggregation for analysis

Knowledge of the link between overweight and chronic disease^a

Knowledge of link between overweight and heart disease

How likely do you think being overweight is a risk factor for… heart disease?

Very unlikely; Slightly unlikely; Neither unlikely nor likely; Slightly likely; Very likely; (Don’t know); (Refused).

Very/Slightly likely cf. all other responses^b.

Knowledge of link between overweight and type 2 dabetes

How likely do you think being overweight is a risk factor for… type 2 diabetes?

Knowledge of link between overweight and cancer

How likely do you think being overweight is a risk factor for… cancer?

Prompted dietary intentions^a

Likely to cut down amount of high calorie food in next 7 days

Over the next 7 days, how likely or unlikely are you to… cut down the amount of high calorie food you eat?

Very unlikely; Slightly unlikely; Neither unlikely nor likely; Slightly likely; Very likely; (Don’t know); (Refused).

Very/Slightly likely cf. all other responses^b.

Likely to drink less sugary drinks in next 7 days

Over the next 7 days, how likely or unlikely are you to… drink less sugary drinks?

Likely to eat smaller serving sizes in next 7 days

Over the next 7 days, how likely or unlikely are you to… eat smaller serving sizes?

Likely to eat more fruit and vegetables in next 7 days

Over the next 7 days, how likely or unlikely are you to… eat more fruit and vegetables?

Behaviour

Fruit consumption

Thinking back over the past 7 days, how many serves of fruit did you usually eat each day? A serve of fruit is equal to one medium piece, two small pieces of fruit or one cup of diced fruit.

Serves per day; None; Less than one a day; (Don’t know); (Refused).

2 or more serves a day cf. all other responses^b.

Vegetable consumption

Thinking back over the past 7 days, how many serves of vegetables did you usually eat each day? A serve of vegetables is equal to half a cup of cooked vegetables or 1 cup of salad.

Serves per day; None; Less than one a day; (Don’t know); (Refused).

For females: 5 or more serves a day cf. all other responses^b.

For males: 6 or more serves day cf. all other responses^b

Sugar sweetened beverage (SSB) consumption

(a) During the past 7 days, on how many days did you drink a can, bottle or glass of a sugar-sweetened drink such as soft drinks, energy drinks, fruit drink, sports drinks and cordial? Do not include diet drinks. (Interviewer note: fruit drink does not include 100% fruit juice). IF 1 to 7: (b) On days that you did drink sugar-sweetened drinks, how many times per day did you usually drink them?

(a) Days in the past 7 drank SSB (Range 0–7); (Don’t know); (Refused); (b) Once a day; twice a day; 3 times per day; 4 or more times per day; (Don’t know); (Refused).

1 or more times in last week cf. all others; 4 or more times in last week cf. all other responses^b.

Fast food consumption

(a) During the past 7 days, on how many days did you eat take-away or ‘fast foods’ (such as fish and chips, hamburgers, fried chicken, pizza, sausage rolls, meat pies)? IF 1 to 7: (b) On days that you did eat take-away or ‘fast food’, how many times per day did you usually eat it?

(a) Days in the past 7 ate fast food (Range 0–7); (Don’t know); (Refused); (b) Once a day; twice a day; 3 times per day; 4 or more times per day; (Don’t know); (Refused).

1 or more times a week cf. all other responses^b.

Sweet food consumption

(a) During the past 7 days, on how many days did you eat sweet foods (such as cakes, biscuits, lollies and chocolates)? IF 1 to 7: (b) On days that you did eat sweet foods, how many times per day did you usually eat it?

a) Days in the past 7 ate sweet foods

(Range 0–7); (Don’t know); (Refused); b) Once a day; twice a day; 3 times per day; 4 or more times per day; (Don’t know); (Refused).

3 or more times a week cf. all other responses^b.