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Table 5 Regression coefficients and percentage changes for portion size intervention variables in analyses of secondary outcomes per day

From: Impact of reducing portion sizes in worksite cafeterias: a stepped wedge randomised controlled pilot trial

Analysis Variable Purchasing from non-intervention categories. Coefficients (95% CIs)a Purchasing from non-intervention categories. Percentage change (%) (95% CIs)a pa Total purchasing from all categories. Coefficients (95% CIs)a Total purchasing from all categories. Percentage change (%) (95% CIs)a pa
Overall Intervention period 0.071 (0.010, 0.132) 7.321 (0.961, 14.083) 0.067 0.004 (− 0.051, 0.059) 0.408 (− 4.992, 6.116) 0.890
By site Intervention period Site 1 0.088 (−0.017,0.194) 9.242 (− 1.664, 21.358) 0.154 − 0.013 (− 0.110,0.083) −1.338 (− 10.418, 8.663) 0.794
Site 2 0.089 (−0.009, 0.186) 9.256 (− 0.904, 20.456) 0.129 0.035 (− 0.054, 0.123) 3.513 (− 5.227, 13.060) 0.474
Site 3 0.111 (0.016, 0.205) 11.701 (1.631, 22.770) 0.064 0.060 (− 0.025, 0.146) 6.231 (− 2.465, 15.702) 0.218
Site 4 0.028 (− 0.067, 0.122) 2.816 (− 6.455, 13.005) 0.587 −0.015 (− 0.100, 0.071) −1.479 (− 9.546, 7.307) 0.745
Site 5 0.111 (0.016, 0.205) 11.707 (1.608, 22.809) 0.065 0.008 (− 0.077, 0.094) 0.824 (− 7.451, 9.839) 0.858
Site 6 0.002 (− 0.095, 0.099) 0.226 (−9.032, 10.426) 0.965 −0.054 (− 0.142, 0.034) −5.257 (− 13.204, 3.418) 0.275
  1. a As the p-values (the more robust Kenward-Roger corrected) and CIs (Wald) presented here have been calculated using different assumptions, there is not always an equivalence of interpretation between the 95% confidence intervals and significant p-values