Final Sample Size (or Number of Clusters) by Treatment Arms
Control group: 16,687
Treatment Total: 33,396
Treatment (1:1 matching grant): 11,133
Treatment (2:1 matching grant): 11,134
Treatment (3:1 matching grant): 11,129
Treatment (Maximum size matching gift $25,000): 8,350
Treatment (Maximum size matching gift $50,000): 8.345
Treatment (Maximum size matching gift $100,000): 8,350
Treatment (Maximum size matching gift unstated): 8,351
Treatment (Suggested amount equal to previous donation): 11,134
Treatment (Suggested amount 12.5 times previous donation): 11,133
Treatment (Suggested amount 1.5 times previous donation): 11,129