<blockquote>Our analyses included all women who answered the questions on abortion throughout follow-up between 1993 and 2003. In 1993, some women responded only to the question on induced abortion but omitted the spontaneous abortion question and vice versa. Of the 105 716 women included in this analysis, 28 392 did not answer the question on induced abortion but answered the question on spontaneous abortion; 13 652 of these women indicated that they had a spontaneous abortion. We assumed that the women who answered only half of the question did not answer the other question because of an oversight or because they felt that the question did not apply to them; we thus coded the missing response as "no induced abortion." Similarly, 22 768 women did not answer the question on spontaneous abortion in 1993; of these, 9167 answered that they had an induced abortion. We again coded the nonresponses as "no spontaneous abortion." Information on induced and spontaneous abortion was updated biennially; since a response option of "no" was not provided on subsequent questionnaires, a response of "no" was coded for either abortion if "yes" was not marked. We conducted sensitivity analyses of our approach. Results did not change when we excluded nonresponses to half of the 1993 question from the analyses or coded a missing response as "no" only if the other part of the question was answered with "yes." </blockquote>--[[User:Britinme|Britinme]] 10:40, 2 May 2007 (EDT) | <blockquote>Our analyses included all women who answered the questions on abortion throughout follow-up between 1993 and 2003. In 1993, some women responded only to the question on induced abortion but omitted the spontaneous abortion question and vice versa. Of the 105 716 women included in this analysis, 28 392 did not answer the question on induced abortion but answered the question on spontaneous abortion; 13 652 of these women indicated that they had a spontaneous abortion. We assumed that the women who answered only half of the question did not answer the other question because of an oversight or because they felt that the question did not apply to them; we thus coded the missing response as "no induced abortion." Similarly, 22 768 women did not answer the question on spontaneous abortion in 1993; of these, 9167 answered that they had an induced abortion. We again coded the nonresponses as "no spontaneous abortion." Information on induced and spontaneous abortion was updated biennially; since a response option of "no" was not provided on subsequent questionnaires, a response of "no" was coded for either abortion if "yes" was not marked. We conducted sensitivity analyses of our approach. Results did not change when we excluded nonresponses to half of the 1993 question from the analyses or coded a missing response as "no" only if the other part of the question was answered with "yes." </blockquote>--[[User:Britinme|Britinme]] 10:40, 2 May 2007 (EDT) |