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Table 3 Differences in food purchases and expenditures between the control and experimental group

From: The effects of a 25% discount on fruits and vegetables: results of a randomized trial in a three-dimensional web-based supermarket

  Control (n = 52) Experiment (n = 63)   
  Mean SD Mean SD Δ experimental - control P (t-test)
FRUIT AND VEGETABLES       
Fruit and vegetable expenditures (€) 11.49 4.74 9.71 4.88 -1.78 (15.5%) 0.05
Purchased vegetables (in items) 6.2 2.6 7.0 3.7 0.8 (12.5%) 0.20
Purchased vegetables (in grams) 2,879 1,241 3,191 1,675 311.7 (10.8%) 0.26
Purchased fruit (items) 1.7 1.1 1.9 1.4 0.2 (9.3%) 0.50
Purchased fruit (in gram) 1,877 1,082 2,171 1,599 293.4 (15.6%) 0.25
Total purchased fruit & vegetables (items) 7.9 3.1 8.8 4.4 0.9 (11.8%) 0.19
Total purchased fruit & vegetables (gram) 4,757 1,846 5,362 2,747 605.0 (12.7%) 0.16
OTHER FOOD ITEMS       
Expenditures in Virtual Supermarket (€) 60.98 27.33 58.86 24.15 -2.12 (-3.5%) 0.66
Total items purchased (n) 45.8 21.0 46.0 19.6 0.31 (.7%) 0.93
Total calories purchased (kcal) 36,343 20,379 35,367 17,543 -976 (2.7%) 0.78
Items in other food categories (n) a 37.8 19.0 37.2 17.4 -0.60 (1.6%) 0.86
Expenditures in other food categories (€)a 50.42 24.58 49.74 22.41 -0.68 (1.3%) 0.40
Expenditures on desserts (e.g., pudding, yoghurt, etc.) (€) 1.60 1.50 1.62 1.62 0.02 (1.3%) 0.96
Expenditures on soda (€) 1.79 1.84 1.69 1.71 -0.10 (5.6%) 0.77
Expenditures on crisps (€) 0.93 1.06 0.71 1.00 -0.22 (23.7%) 0.26
Expenditures on candy (excl. chocolate)(€) 0.75 1.34 0.55 0.94 -0.20 (26.7%) 0.34
Expenditures on chocolate (€) 0.49 0.96 0.37 0.91 0.12 (24.9%) 0.49
  1. aTotal expenditures in food categories other than fruit and vegetables