Table 1 Respondents before and after each reminder for the three randomised groups, and final response rates
Group A: Postal (n = 836) | Group B: Mixed (n = 860) | Group C: Electronic (n = 830) | |
|---|---|---|---|
Respondents before reminder | |||
Electronic, n | – | 59 | 146 |
Paper, n | 220 | 185 | – |
Response rate, % | 26.3 | 28.4 | 17.6 |
Respondents after first reminder | |||
Electronic, n | – | 21 | 118 |
Paper, n | 140 | 109 | – |
Increase in response rate, % | 16.7 | 15.1 | 14.2 |
Respondents after second reminder | |||
Electronic, n | – | 16 | 81 |
Paper, n | 157 | 146 | – |
Increase in response rate, % | 18.8 | 18.8 | 9.8 |
Total | |||
Electronic, n | – | 96 (17.9) | 345 |
Paper, n | 517 | 441 (82.1) | – |
Response rate, % | 61.8 | 62.4 | 41.6 |