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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