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Table 2 Participant characteristics

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) P(t- test)
Virtual shopping budget (€)   76.60 (39.53) 70.87 (31.27) .40
Household size   2.63 (1.77) 2.43 (1.59) .51
   N (%) N (%) P(Chi2 test)
Sex (n = 115) Female 43 (82.7) 48 (76.2) .39
Age (n = 63) a 18-31 3 2 .52
  32-46 8 15  
  47-61 16 14  
  62 + 2 3  
Ethnicity Native Dutch 50 (96.2) 58 (92.0) .46
Grocery responsibility Totally responsible for groceries 37 (71.1) 33 (52.4) .12
  Largely responsible for groceries 7 (13.5) 13 (20.6)  
  Partly responsible for groceries 8 (15.4) 17 (27.0)  
Education level Low (primary/lower secondary) 20 (38.5) 5 (8.0) < .001
  Medium (higher secondary/intermediate vocational) 22 (42.3) 46 (73.0)  
  High (higher vocational/University) 10 (19.2) 12 (19.0)  
Employment status Employed 27 (51.9) 42 (66.7) .27
  Other 25 (48.1) 21 (33.3)  
Household income (n = 63) Low (0-2000) 11 (37.9) 9 (26.5) .53
(gross monthly in €) a, b Medium (2000-3000) 8 (27.6) 9 (26.5)  
  High (3000+) 10 (34.5) 16 (47.0)  
Price perception score c   40.7 (7.4) 43.1 (6.0) .06
Habit score d   35.5 (4.8) 37.2 (4.4) .06
Appreciation score Virtual Supermarket e   30.4 (4.2) 29.0 (3.7) .06
  1. aDue to technical issues, this question was not asked to all respondents
  2. bThe standard gross monthly income in the Netherlands (2010) is € 2,508 [30]
  3. cMeasured by 15 items (5-point Likert scale) from the seven "price perception construct scale items" (Lichenstein et al., 1993).
  4. dMeasured by twelve items (5-point Likert scale) self-report index of habit strength (Verplanken et al., 2003)
  5. eMeasured by eight items (5-point Likert scale) on the Virtual Supermarket software