|
Response rate for the Million Women Study* |
|||
| Estimated number of women who were sent a questionnaire |
227 000 |
||
| when they were invited for screening |
|||
| Estimated number who were screened (75% of those invited [1]) |
170 000 |
||
| Number of women who returned a questionnaire |
121 129 |
(53% of those invited and 71% of those screened) |
|
| Number of women who returned a questionnaire with full |
113 104 |
(50% of those invited, 66% of those screened and |
|
| identification details and signed permission for follow-up |
93% of those returning a questionnaire) |
||
| Number of women who returned a questionnaire without full |
8025 |
(3.5% of those invited, 4.7% of those screened and |
|
| identification details and/or signed permission for follow-up |
6.6% of those returning a questionnaire) |
||
|
*For the first printing of the Million Women Study questionnaire. | |||
The Million Women Study Collaborative Group Breast Cancer Res 1999 1:73 doi:10.1186/bcr16 |
|||