Maternal Smoking and Placenta Previa

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Abstract
We conducted a case-control study of the relation between smoking and placenta previa, using Washington State birth certificate data from 1984 through 1987. The study population was comprised of live, singleton births to women whose pregnancies were complicated by placenta previa (N = 598) and randomly selected controls (N = 2,422) from the same time period. We used logistic regression to estimate odds ratios (OR) and their 95% confidence intervals (CI). Maternal smoking approximately doubled the risk of placenta previa after adjustment for the confounding effect of maternal age (OR = 2.1, 95% CI: 1.7-2.5).

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