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Table 1 Number of swaps offered, potential basket energy density, number of swaps accepted and bought basket energy density by participant group

From: Offering within-category food swaps to reduce energy density of food purchases: a study using an experimental online supermarket

  Group Planned contrast effect sizes (95 % CI)
  Control (n = 159) Consent-checkout (n = 137) Consent-selection (n = 131) Imposed-checkout (n = 141) Imposed-selection (n = 152) Intervention vs Control Consent vs Imposed Selection vs Checkout
N Swaps offered - 4.17 3.96 4.01 4.17 - −0.003 (−0.04 – 0.03) −0.003 (−0.04 – 0.03)
Potential basket ED (kJ/100 g) 1037.6 969.6 962.9 939.1 947.1 −82.9*** (−110.1 – -55.8) 23.1 (−2.4 – 48.7) 0.6 (−24.9 – 26.2)
N swaps accepted (median, OR) - 0 (0–1) 1 (0–2) 0 (0–1) 1 (0–2) - 0.977 (0.88 – 1.08) 1.224 (1.11 – 1.35)
Bought basket ED (kJ/100 g) 1037.6 1026.5 1023.3 997.0 1007.2 −24.1 (4.04 – -52.23) 22.8 (−3.69 – 49.26) 3.53 (−22.94 – 20.01)
  1. ***: p < 0.001