| Denominator | To recruit 100 (letter only - 5.1% response) | To recruit 100 (letter plus follow-up telephone calls - 8.8% response) | |||
---|---|---|---|---|---|---|
Activity | Number | Time (minutes) | Number | Time (minutes) | Number | Time (minutes) |
Database searching | Per practice/location | 60 | Per practice | 60 | Per practice | 60 |
Initial screening | To produce 200 eligible | 60 | 1,961 | 588 | 1,336 | 401 |
Mailing invitations | 200 | 240 | 1,961 | 2,353 | 1,336 | 1,603 |
GP screening of responses | 1 | 2 | 100 | 200 | 100 | 200 |
Associated researcher time | 1 | 18* | 100 | 1,800 | 100 | 7,134 |
145** |