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Table 1 Response rate for the Million Women Study*

From: The Million Women Study: design and characteristics of the study population

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)
  1. *For the first printing of the Million Women Study questionnaire.