Table 1 Response rate for the Million Women Study^*

Estimated number of women who were sent a questionnaire

when they were invited for screening

Estimated number who were screened (75% of those invited [1])

Number of women who returned a questionnaire

(53% of those invited and 71% of those screened)

Number of women who returned a questionnaire with full

(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

(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)