Nausea and vomiting of early pregnancy and pregnancy outcome. An epidemiological study

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Abstract
The association of nausea and vomiting in pregnancy with the outcome of pregnancy was investigated in a historical cohort of 903 women in Los Angeles, California, USA. Multivariable statistical methods were employed to control for the potential confounding effects of age, ethnicity, occupation, and anti-emetic use on pregnancy outcome. The analyses indicated that vomiting was associated with decreased risk of miscarriage (adjusted odds ratio 0.18, 95% CI 0.06 to 0.53); women with nausea but no vomiting had a miscarriage risk equal to that in the sample overall. Among the subsample of women with signs of threatened miscarriage, those who had experienced vomiting had a decreased risk of miscarriage (10.3% vs 31.7% in the subsample). No statistically significant association was observed between nausea and vomiting of pregnancy and other pregnancy outcomes (perinatal mortality, fetal anomalies, neonatal anthropometric measures).

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