![]() ![]() Many published abortion studies are flawed in this way because women who have had an abortion are less likely to report their prior abortion if they have not experienced a long-term adverse health outcome. When this occurs, a study is likely to conclude erroneously that the negative health outcome is associated with the exposure. As a consequence, healthy subjects with an exposure are more likely than unhealthy subjects to be mistakenly assigned to a nonexposure study group. 3 In case control studies, for example, subjects who had a particular negative health outcome may be more likely to report having had the past exposure compared with subjects who also had the exposure but did not have the outcome. The committee found that selective recall bias-which occurs when there are systematic differences in study subjects' reporting of a past exposure (e.g., a prior abortion)-affects much of the published research on abortion's long-term health effects. ![]() Inconsistencies also were seen between women's responses during the interviews and on the self-administered questionnaire. Overall, the number of self-reported abortions was only 47 percent of the total estimated number of abortions performed in the United States during the study period. Tallies of the survey responses were compared with national estimates of the number of abortions performed during the time period. Data were collected from face-to-face interviews and computer-assisted, self-administered questionnaires. Jones and Kost (2007) pooled data from the 1997 to 2001 annual National Survey of Family Growth to assess the accuracy of women's reports of the number of their past pregnancies and the timing and outcome of each pregnancy. Women who have had an abortion have a tendency not to recall-or not to report-having had an abortion when asked ( Anderson et al., 1994 Bouyer et al., 2003 Hogue, 1975 Jones and Kost, 2007 Lindefors-Harris et al., 1991). Several studies have demonstrated underreporting of past abortions in surveys of American women ( Beral et al., 2004 Jones and Kost, 2007 Steinberg et al., 2011). ![]()
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