Exploratory analyses
Exploratory analyses were conducted to investigate the source of the unexpected increased kcals ordered from the fast food outlet in proportional pricing conditions (Supplementary material XI). There was no main effect of pricing condition on kcals ordered from meals ordered, but there was for kcals from additional optional side dish orders; being in the proportional pricing condition was associated with increased kcals ordered from additional sides (54.44kcals, 95% CI 37.94 to 70.93).