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Neonatal mortality of infants with hypoplastic left heart syndrome by driving time from birth location to cardiac surgical center, among birth eras (A) and with prenatal versus postnatal diagnosis (B). Comparison of mortality among birth eras, accounting for time to CSC, p=0.002. Comparison of mortality by prenatal diagnosis, accounting for time to CSC, p=0.90. Error bars represent 95% confidence intervals.
