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Purpose
Accurate ascertainment of gestational age (GA) has been a challenge in perinatal epidemiologic research. To date, no study has validated GA algorithms in Medicaid Analytic eXtract (MAX).
Methods
We linked livebirths of mothers enrolled in Medicaid ≥30 days after delivery in 1999‐2010 MAX to state birth certificates. We used clinical/obstetric estimate of gestation on the birth certificates...
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