Epidemiology 2017 11;28(6):854-862
From the aCenter for Clinical Epidemiology, Lady Davis Institute, Jewish General Hospital, Montreal, QC, Canada; bDepartment of Epidemiology, Biostatistics, and Occupational Health, McGill University, Montreal, QC, Canada; cDepartment of Pediatrics, McGill University, Montreal, QC, Canada; and dDepartment of Medicine, McGill University, Montreal, QC, Canada.
Background: Studies on the safety of prenatal medication use require valid estimation of the pregnancy duration. However, gestational age is often incompletely recorded in administrative and clinical databases. Our objective was to compare different approaches to estimating the pregnancy duration. Read More