Pregnancy cohorts built from observed deliveries or outcomes are biased when outcomes are missing, while cohorts including all pregnancies are unbiased only when missingness is due to measured covariates.
Use of real-world evidence from healthcare utilization data to evaluate drug safety during pregnancy
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Bias in studies of prenatal exposures using real-world data due to pregnancy identification method
Pregnancy cohorts built from observed deliveries or outcomes are biased when outcomes are missing, while cohorts including all pregnancies are unbiased only when missingness is due to measured covariates.