Group | Historical controls (n = 105) | Payment (n = 442) | Difference in response rates (CI) |
---|---|---|---|
Initial mailing | 39.0% (41/105) | 53.8% (238/442) | 14.8% (4.2 to 24.7) |
1st reminder | 26.6% (17/64) | 40.8% (84/206) | 14.2% (0.6 to 25.7) |
2nd reminder | 40.4% (19/47) | 32.5% (38/117) | -7.9% (-24.2 to 7.6) |
Telephone reminder | 19.2% (5/26) | 37.2% (29/78) | 17.9% (-3.2 to 33.4) |
Total | 78.1% (82/105) | 88.0% (389/442) | 9.9% (2.3 to 19.1) |