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Table 3 Subgroup analyses of the percentage of energy from saturated fat (primary outcome) by trial group

From: Prominent positioning and food swaps are effective interventions to reduce the saturated fat content of the shopping basket in an experimental online supermarket: a randomized controlled trial

  % energy from saturated fat (mean ± SD, n) Between group mean difference (95% CI)
Control Swaps Altering order Combined Altering order vs Swaps Combined vs Swaps Combined vs Altering order
Sex
Female 25.58 ± 5.62, 172 24.3 ± 6.08, 183 21.26 ± 6.12, 179 21.11 ± 6.09, 174 − 3.04 (− 4.66 to − 1.42) −3.19 (− 4.82 to − 1.55) − 0.14 (− 1.78 to 1.5)
Male 25.81 ± 5.69, 103 22.54 ± 5.81, 96 19.59 ± 6.55, 80 18.72 ± 6.91, 96 − 2.95 (− 5.39 to − 0.51) − 3.82 (− 6.14 to − 1.5) − 0.87 (− 3.31 to 1.57)
Age, years
Median and above 25.74 ± 5.89, 142 22.9 ± 6.56, 144 21.54 ± 6.35, 134 21.03 ± 6.51, 131 − 1.36 (− 3.32 to 0.59) −1.87 (− 3.84 to 0.1) − 0.51 (− 2.51 to 1.5)
Below median 25.59 ± 5.37, 133 24.54 ± 5.32, 135 19.81 ± 6.15, 127 19.56 ± 6.34, 142 −4.73 (− 6.58 to − 2.88) −4.98 (− 6.78 to − 3.18) −0.25 (− 2.08 to 1.58)
Ethnic group
White 25.66 ± 5.73, 240 23.77 ± 5.88, 256 20.8 ± 6.29, 241 20.22 ± 6.43, 244 − 2.96 (− 4.37 to − 1.56) −3.55 (− 4.95 to − 2.15) −0.59 (− 2.01 to 0.84)
Non-White 25.74 ± 4.97, 35 22.94 ± 7.85, 22 19.44 ± 6.57, 19 20.65 ± 6.81, 28 −3.5 (− 8.78 to 1.78) −2.29 (− 7.09 to 2.51) 1.21 (− 3.8 to 6.22)
BMI, kg/m2
  < 30 25.86 ± 5.31, 199 23.72 ± 6.14, 195 20.11 ± 6.35, 170 20.64 ± 6.51, 200 −3.61 (− 5.26 to − 1.97) −3.08 (− 4.66 to − 1.5) 0.53 (− 1.11 to 2.17)
  ≥ 30 25.44 ± 6.14, 73 23.61 ± 5.86, 83 22.12 ± 6.04, 86 19.39 ± 6.14, 69 −1.5 (− 3.9 to 0.9) − 4.22 (− 6.76 to − 1.68) − 2.72 (− 5.24 to − 0.2)
Education
None/Secondary 25.09 ± 5.83, 68 23.52 ± 6.49, 103 20.07 ± 5.87, 99 19.89 ± 6.69, 79 −3.46 (− 5.73 to − 1.19) −3.63 (− 6.04 to − 1.22) −0.17 (− 2.6 to 2.26)
Higher 25.86 ± 5.57, 207 23.79 ± 5.79, 175 21.1 ± 6.55, 161 20.41 ± 6.38, 193 −2.7 (− 4.4 to − 0.99) −3.38 (− 5.01 to − 1.75) − 0.69 (− 2.35 to 0.98)
Household income
Low-middle (£25-39 k) 25.42 ± 5.57, 191 23.21 ± 6.28, 188 20.36 ± 6.29, 181 19.81 ± 6.3, 177 − 2.85 (− 4.49 to − 1.21) − 3.4 (− 5.05 to − 1.76) − 0.55 (− 2.22 to 1.11)
Higher (£40 k+) 26.2 ± 5.79, 75 24.86 ± 5.38, 84 21.67 ± 6.25, 70 21.6 ± 6.54, 86 − 3.2 (− 5.71 to − 0.69) −3.26 (− 5.64 to − 0.88) −0.07 (− 2.56 to 2.43)