The ‘Eat Well @ IGA’ healthy supermarket randomised controlled trial: process evaluation

Table 1 Demographic characteristics of customer survey participants (n = 500)

Characteristic	Overall		Store 1 (n = 104)	Store 2 (n = 97)	Store 3 (n = 101)	Store 4 (n = 100)	Store 5 (n = 98)	Heterogeneity across stores (p-value) ^b	State of Victoria (%)
Characteristic	n	Estimated percentage [95%CI] ^a	Proportion (%)					Heterogeneity across stores (p-value) ^b	State of Victoria (%)
Female	355	72 [68,76]	67	75	70	75	74	0.650	51.9 ^c
Aged 55 + years	322	65 [61, 70]	63	68	65	72	60	0.445	33.0 ^c
High SEIFA ^d	284	61 [16, 93]	7	92	93	10	89	< 0.001	~ 50
University degree or higher	165	34 [26,42]	24	32	34	27	52	< 0.001	24.3 ^c
Regular weekly shop always or usually at this store	234	64 [56,72]	67	71	60	73	49	0.010	N/A
Shop regularly at competitor supermarket	463	93 [90, 95]	92	92	90	93	96	0.621	N/A

n = 500 customer surveys at the 5 intervention stores, range of 97 to 104 surveys per store. N/A data not available
^a Estimated using univariate logistic models with store as random effect to account for the clustering induced by store. ^b Chi-squared test of differences in proportions across stores; ^c Persons 15 years and older; ^d SEIFA, Index of Relative Socio-Economic Disadvantage- Socio-Economic Indexes for Areas [19]. ‘High’ SEIFA reflects top half of Victorian SEIFA groupings

ISSN: 1479-5868