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Table 4 Average monthly spending and items by Arm (mean [SD])

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  
Intervention Components
Cash Back % 10% 10% 10% 25% 10 + 15%NET 10 + 15%NET  
Weekly Text Message None Generic Personalized Personalized Personalized Personalized p-values
Monthly Text Message Standard Standard Standard Standard Standard Unbundled 1v 2 1 v 3 2 v 3 3 v 4 4 v 5 5 v 6
Outcomes
 % Healthy Spending 24.8 (11.4) 26.8 (12.9) 24.9 (11.7) 25.7 (11.5) 25.9 (12.7) 26.5 (13.0) 0.093 0.652 0.032 0.213 0.880 0.572
 % Unhealthy Spending 24.4 (20.1) 21.7 (17.2) 22.4 (17.7) 21.7 (17.1) 23.9 (19.9) 22.3 (19.1) 0.031 0.121 0.547 0.514 0.121 0.039
 % Healthy Items 27.8 (12.5) 30.2 (13.9) 28.4 (12.7) 29.5 (12.8) 28.9 (13.6) 30.0 (14.5) 0.063 0.971 0.067 0.211 0.545 0.365
 % Unhealthy Items 29.4 (19.8) 26.6 (17.5) 27.2 (17.7) 26.3 (17.2) 28.5 (19.8) 26.9 (19.2) 0.028 0.106 0.561 0.389 0.148 0.068