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Table 3 Participant demographic and baseline shopping characteristics

From: Use of financial incentives and text message feedback to increase healthy food purchases in a grocery store cash back program: a randomized controlled trial

Study Arm 1 2 3 4 5 6 Overall
N 450 502 465 468 497 459 2841
Intervention Components
Cash Back % 10% 10% 10% 25% 10 + 15%NET 10 + 15%NET  
Weekly Text Message None Generic Personalized Personalized Personalized Personalized  
Monthly Text Message Standard Standard Standard Standard Standard Unbundled  
Characteristics
 Female (%)a 47.1 44.8 47.3 44.2 49.3 46.2 46.5
 Age, mean (SD) 47.9 (11.8) 48.3 (11.7) 47.0 (11.6) 47.4 (11.6) 47.7 (11.9) 48.5 (12.0) 47.8 (11.8)
 Household Size, mean (SD) 3.0 (1.3) 2.9 (1.3) 3.0 (1.2) 3.0 (1.2) 2.9 (1.2) 2.9 (1.3) 2.9 (1.2)
 Vitality membership, mean weeks (SD) 110.5 (56.9) 110.1 (56.2) 111.7 (58.3) 107.3 (55.6) 112.2 (58.2) 112.4 (57.8) 110.7 (57.1)
 Region (%)
  Gauteng 64.2 65.5 64.9 69.7 66.2 63.4 65.7
  Kwazulu-Natal 8.7 8.2 9.9 7.5 10.3 9.4 9.0
  Western Cape 19.1 20.3 16.3 15.4 16.7 18.5 17.7
  Other 8.0 6.0 8.8 7.5 6.8 8.7 7.6
 Shopping trips/month, mean (SD) 7.9 (4.4) 7.9 (4.1) 8.1 (4.0) 7.7 (4.3) 7.9 (4.1) 8.3 (4.2) 8.0 (4.2)
 Healthy Spending, mean Rand (SD) 895.0 (548.9) 923.4 (608.9) 851.8 (511.9) 843.5 (506.0) 878.9 (540.5) 906.1 (521.4) 883.4 (541.9)
 Unhealthy Spending, mean (SD) 558.3 (347.1) 539.0 (302.2) 549.0 (326.1) 515.0 (303.6) 532.0 (313.0) 526.6 (332.4) 536.5 (320.6)
 Neutral Spending, mean (SD) 1823.5 (963.5) 1760.5 (881.9) 1818.8 (944.6) 1727.3 (888.4) 1736.5 (930.6) 1786.6 (900.5) 1774.6 (918.1)
 # Healthy Items, mean (SD) 36.1 (21.2) 37.5 (23.7) 34.9 (20.5) 34.8 (21.0) 35.9 (21.6) 37.1 (20.6) 36.1 (21.5)
 # Unhealthy Items, mean (SD) 26.4 (18.4) 24.6 (14.9) 25.2 (15.8) 23.7 (15.1) 24.2 (15.4) 24.1 (16.4) 24.7 (16.0)
 # Neutral Items, mean (SD) 53.7 (28.8) 51.8 (26.2) 52.8 (27.0) 50.2 (25.7) 50.7 (26.1) 52.2 (27.0) 51.9 (26.8)
 % Healthy Spending, mean (SD) 27.5 (10.4) 28.3 (11.8) 26.6 (9.7) 27.7 (10.2) 27.9 (10.5) 28.5 (11.4) 27.7 (10.7)
 % Unhealthy Spending, mean (SD) 17.8 (7.6) 17.7 (7.3) 17.7 (7.6) 17.3 (6.8) 17.7 (7.5) 16.9 (7.5) 17.5 (7.4)
 % Healthy Items, mean (SD) 31.4 (11.2) 32.5 (12.7) 30.8 (10.7) 32.1 (11.3) 32.2 (11.6) 33.1 (12.8) 32.0 (11.8)
 % Unhealthy Items, mean (SD) 22.6 (9.5) 22.1 (9.3) 22.5 (9.4) 21.9 (9.0) 22.1 (9.2) 21.1 (9.3) 22.1 (9.3)
  1. NOTE: Shopping characteristics are monthly averages across the 12 months prior to intervention
  2. aThis gender breakdown reflects the gender of the primary Vitality member, not necessarily the family member doing the shopping