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I was looking at the variables in the Collaborative Psychiatric Epidemiology Surveys (CPES) and I need to know how pregnant women are identified in the surveys. Also, how many pregnant women are in the samples?
You can ascertain who is pregnant from looking at the Premenstrual Syndrome section of the survey instruments. One question asks if the respondent reports that she has stopped having periods temporarily:
PR6 - Still menstruating/stopped temporarily/stopped permanently.
A follow-up question (PR12) inquires if the cessation is due to pregnancy.
You can view these variables and their frequency counts for CPES in any of its three component surveys on the CPES website:
http://www.icpsr.umich.edu/cocoon/cpes/cpes/BLPREMENST/all/section.xml