The impact of financial incentives on participants’ food purchasing patterns in a supermarket-based randomized controlled trial

Table 2 Proportion of participants in the SHELF RCT who reported changing their proportionate food purchasing in study supermarkets

	Change from baseline to post-intervention (%) n = 619				Change from post-intervention to 6-months post-intervention (%) n = 606
	Control n = 157	Price reduction n = 158	Skill-building n = 151	Combined n = 153	Control n = 154	Price reduction n = 154	Skill- building n = 148	Combined n = 150
Change^a in proportion of total food and groceries bought from Coles
Increase	18.5	23.9	18.5	21.7	19.7	19.0	19.7	19.1
No change	58.0	58.5	56.3	54.6	53.3	50.3	61.3	57.8
Decrease	23.6	17.6	25.2	23.7	27.0	30.7	19.0	23.1
Change^a in proportion of fruits and vegetables bought from Coles
Increase	19.1	35.2	20.5	23.0	22.4	21.6	21.1	19.1
No change	58.0	49.7	56.3	59.2	55.3	43.1	53.5	57.1
Decrease	22.9	15.1	23.2	17.8	22.4	35.3	25.4	23.8

^aChange in self-reported fruit and vegetable purchasing was calculated as the difference between the proportion of fruits and vegetables participants reported to have purchased in study supermarkets at T2 compared to T1, and in the proportion of fruits and vegetables participants reported to have purchased in study supermarkets at T3 compared to T2

ISSN: 1479-5868