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Table 1 The National Women's Health Survey – response rates

From: The National Women's Health Study: assembly and description of a population-based reproductive cohort

STAGE 1 No. Crude % Adjusted1 %
TOTAL QUESTIONNAIRES POSTED 60,814 100% -
Returned undelivered2 3,661 6% -
Responded 26,050 43% 46%
   Did not wish to participate 2,738 5% 5%
   Aged >55 years or otherwise ineligible3 5,564 9% 10%
   Aged < = 55 years but never attempted to have children 4,713 8% 8%
   Aged < = 55, ever attempted to have children 13,035 21% 23%
   Among whom,    
- Never pregnant 340 3% -
- Ever pregnant 12,695 97% -
STAGE 2    
TOTAL QUESTIONNAIRES POSTED 10,828 100% -
Returned undelivered 16 0.2% -
Responded 7,882 73% 73%
   No longer wished to participate 180 2% 2%
   Completed questionnaire 7,702 71% 71%
   Among whom,    
- Attempted pregnancy, never pregnant 194 3%  
- Ever pregnant 4 7,508 97%  
  1. 1 Adjusted for undelivered mail 2 Includes 70 women who died before the study start 3 Under 18 at study start (6th November 2001); male; foreign national; or too ill to participate 4 344 women who had had a miscarriage since 1995, but whose last pregnancy was not a miscarriage, were sent a second stage 2 questionnaire and were asked to supply details in relation to their most recent miscarriage. 285 (83%) of the women responded to this third questionnaire.