Table 1 The impact of response-enhancement measures on participation rate (Eligible participants = 4452 subjects)
Response-enhancement measures | Number of positive answers | Participation rate |
|---|---|---|
First invitation | 1072 | 24.1% |
Two reminders | 323 | 7.3% |
Repeated phone calls | 37 | 0.8% |
Total participants | 1432 | 32.2% |