Unplanned additional analyses
REGRESSION
Data from the three outlets were combined to examine any overall effects of calorie labelling condition and proportional pricing condition across the three outlet types. For size choice, participants were given a score of 0 to 3 according to the number of times they selected a larger portion size. A linear regression model was used to examine associations of calorie labelling condition, pricing condition and their interaction with this outcome. For both kcals ordered and hypothetical spend, mixed ANOVAs were used to observe any main effects of calorie labelling condition, pricing condition and their interaction on the outcomes. In the mixed ANOVAs, the within-subjects factor was the outlet and the between-subjects factors were calorie labelling condition and pricing condition.