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.
Bias from restricting to live births when estimating effects of prescription drug use on pregnancy complications: A simulation
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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.