Preterm Birth. Preterm births are defined as a live xxxxxxxxx birth where the obstetric estimate of gestation is less than 37 completed weeks. For births without an obstetric estimate of gestation, gestation will be calculated from the self-reported date of last menses. Data will be obtained from vital statistics birth records.
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Samples: casesmartimpact.com, govlab.hks.harvard.edu, govlab.hks.harvard.edu
