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Number of participants and retention rate for each wave of the study.
| Group | ||
|---|---|---|
| Wave | Control | Experimental |
| 1: April 6–15 | 1124 (100%) | 1153 (100%) |
| 2: April 16–25 | 1041 (92.6%) | 1075 (93.2%) |
| 3: April 26–May 5 | 964 (85.8%) | 1003 (87.0%) |
| 4: May 6–15 | 902 (80.3%) | 940 (81.5%) |
| 5: May 16–25 | 854 (76.0%) | 895 (77.6%) |
| 6: May 26–June 4 | 814 (72.4%) | 845 (73.3%) |
| 7: June 5–14 | 761 (67.7%) | 802 (69.6%) |
