Study objective-To compare recall of smoking habits during pregnancy 0.5-3 years after delivery across groups defined by recall time (5 six month periods) and pregnancy outcome (pre-eclampsia, preg- nancy induced hypertension, intrauterine growth retardation, preterm or post-term delivery compared with controls). Design-Case-control nested in cohort Study. Setting and participants-A subsample of 503 women from a cohort of 6347 women established between 1989 and 1991 in Aarhus University Hospital.
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