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

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

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 (%)
n Estimated percentage [95%CI] a Proportion (%)
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
  1. n = 500 customer surveys at the 5 intervention stores, range of 97 to 104 surveys per store. N/A data not available
  2. 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
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