| Denominator | To recruit 100 (letter only - 6.8% response) | To recruit 100 (letter plus follow-up telephone calls - 11.1% 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 | 1,471 | 441 | 901 | 270 |
Mailing invitations | 200 | 240 | 1,471 | 1,765 | 901 | 1,081 |
GP screening of responses | 1 | 2 | 100 | 200 | 100 | 200 |
Associated researcher time | 1 | 24* | 100 | 2,400 | 100 | 7,547 |
157** |