Purchase of healthy items in the full sample and in the subsample during each of the five study periods. The full sample includes purchases made by all patrons in the target concession in each study period. Values are derived from cash register sales data. The subsample includes purchases made by patrons whose food purchases were directly observed (40.7% of all items purchased in the target concession).
Olstad et al. International Journal of Behavioral Nutrition and Physical Activity 2014 11:6 doi:10.1186/1479-5868-11-6