Journal
BRITISH MEDICAL JOURNAL
Volume 322, Issue 7281, Pages 266-270Publisher
BRITISH MED JOURNAL PUBL GROUP
DOI: 10.1136/bmj.322.7281.266
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Objective To estimate th risk of adverse birth outcome in women who take non-steroidal anti-inflammatory drugs during pregnancy. Design and setting Population based cohort study and a case-control study, both based on data from a prescription registry, the Danish birth registry, and cone country's hospital discharge registry. Participants Cohort study: 1462 pregnant women who had taken up prescriptions for non-steroidal anti-inflammatory drugs in the period from 30 days before conception to birth and 17 259 pregnant women who were not prescribed any drugs during pregnancy. Case-control study: 4268 women who had miscarriages, of whom 63 had taken non-steroidal anti-inflammatory drugs, and 29 750 primiparous controls who had live births. Main outcome measures Incidences of congenital abnormality, low birth weight, preterm birth, and miscarriage. Results Odds ratios for congenital abnormality, low birth weight, and preterm birth among women who took up prescriptions for no-steroidal anti-inflammatory drugs were 1.27 (95% confidence integral 0.93 to 1.75 (0.79 (0.45 to 1.38), and 1.05 (0.80 to 1.39) respectively. Odds ratios for the taking up of prescriptions in the weeks before miscarriage ranged from 6.99 (2.75 to 17.74) when prescriptions were taken up during the last week before the miscarriage to 2.69 (1.81 to 4.00) when taken up between 7 and 9 weeks before. The risk estimates were no different when the analysis was restricted to missed abortions. Conclusions Use of non-steroidal anti-inflammatory drugs during pregnancy does not seem of increase the risk of adverse birth outcome but is associated wit increased risk of miscarriage.
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