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Table 3 Sales (mean ± SE) of food items with energy labels; during 5 weeks of each intervention periods compared with corresponding 5 weeks pre-interventions in the previous year

From: The Effect of Energy Labelling on Menus and a Social Marketing Campaign on Food-Purchasing Behaviours of University Students

   Baseline period kJ labelling only period Baseline period kJ labelling + social marketing campaign period
Food Energy (kJ) 5 weeks pre-kJ labelling in the previous year 5 weeks of kJ labelling only Difference Relative change %a P value 5 weeks pre-kJ + social marketing campaign in the previous year 5 weeks of kJ + social marketing campaign Difference Relative change %d P value
 <-------------------------------------mean ± standard error------------------------------------->
Plate of chips 2882 39 ± 0.38 38.5 ± 0.38 −0.51 −1.33 0.15 40.7 ± 0.42 40.1 ± 0.34 −0.61 −1.52 0.29
Chicken Schnitzel Burger 3260 8.4 ± 0.09 7.8 ± 0.08 −0.60 −7.66 0.13 8.2 ± 0.11 7 ± 0.04 −1.27 −18.20 0.11
Chicken Schnitzel & Chips 3430 9.4 ± 0.16 14.2 ± 0.13 4.77 33.65 0.05b 9.6 ± 0.06 14.2 ± 0.27 4.61 32.50 0.04b
Nachos 3500 4.5 ± 0.04 4.4 ± 0.05 −0.08 −1.94 0.15 5 ± 0.08 4.4 ± 0.06 −0.63 −14.21 0.11
Chicken Caesar Burger 3580 7 ± 0.08 5.3 ± 0.06 −1.66 −31.36 0.06 6.8 ± 0.08 4.6 ± 0.04 −2.27 −49.65 0.01b
Manning Burger 3690 12 ± 0.11 11.5 ± 0.12 −0.43 −3.69 0.15 10.7 ± 0.11 11.4 ± 0.06 0.62 5.50 0.21
Fish n Chips 3950 3.3 ± 0.03 3.1 ± 0.03 −0.23 −7.52 0.13 2.8 ± 0.03 3.1 ± 0.08 0.34 11.02 0.21
Steak & Chips 4000 7.7 ± 0.06 8.7 ± 0.08 1.01 11.58 0.13 6.6 ± 0.06 8 ± 0.08 1.42 17.83 0.02b
Grill Burger 5500 8.8 ± 0.06 6.5 ± 0.07 −2.26 −34.57 0.05b 9.6 ± 0.06 7.4 ± 0.03 −2.23 −30.22 0.00b
  1. Difference represents the change in percentage of sales between the intervention and baseline periods (corresponding weeks the year before)
  2. aRelative Change % = ((Intervention - Pre)/Intervention)*100
  3. bSignificant change in sales P ≤ 0.05; analysis to determine significance between intervention and comparative weeks periods performed using Mann–Whitney U test for non-normally distributed data