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Perinatal morbidity associated with late preterm deliveries compared to deliveries between 37β40 weeks
ObjectiveTo estimate the risk of short-term complications in neonates born between 34 and 36 weeks by week of gestation.DesignThis is a retrospective cohort study.SettingDeliveries in 2005 in the United States of America.PopulationSingleton live births between 34 and 40 weeks gestational age.MethodsGestational age was subgrouped into 34, 35, 36 and 37β40 completed weeks. Statistical comparisons were performed using chi-square test and multivariable logistic regression models, with 37β40 weeks gestational age designated as referent.Main Outcome MeasuresPerinatal morbidities, including 5-minute Apgar scores, hyaline membrane disease, neonatal sepsis/antibiotics use, and admission to the intensive care unit.ResultsThere were 175,112 neonates born between 34 and 36 weeks in 2005. Compared to neonates born between 37 and 40 weeks, neonates born at 34 weeks had higher odds of 5-minute Apgar<7 (adjusted odds ratio [aOR]=5.51, 95% CI [5.16β5.88]), hyaline membranes disease (aOR=10.2 [9.44β10.9]), mechanical ventilation use >6 hours (aOR=9.78 [8.99β10.6]) and antibiotics use (aOR=9.00 [8.43β9.60]). Neonates born at 35 weeks were similarly at risk of morbidity, with higher odds of 5-minute Apgar <7 (aOR 3.42 [3.23β3.63], surfactant use (aOR 3.74 [3.21β4.22], ventilation use >6 hours (aOR 5.53 [5.11β5.99] and NICU admission (aOR 11.3 [11.0β11.7). Further, neonates born at 36 weeks remain at higher risk of morbidity compared to deliveries at 37β40 weeks.ConclusionsWhile the risk of undesirable neonatal outcomes decreases with increasing gestational age, the risk of neonatal complications in late preterm births remains higher compared to infants delivered at 37β40 weeks gestation
Perinatal morbidity associated with late preterm deliveries compared to deliveries between 37β40 weeks
ObjectiveTo estimate the risk of short-term complications in neonates born between 34 and 36 weeks by week of gestation.DesignThis is a retrospective cohort study.SettingDeliveries in 2005 in the United States of America.PopulationSingleton live births between 34 and 40 weeks gestational age.MethodsGestational age was subgrouped into 34, 35, 36 and 37β40 completed weeks. Statistical comparisons were performed using chi-square test and multivariable logistic regression models, with 37β40 weeks gestational age designated as referent.Main Outcome MeasuresPerinatal morbidities, including 5-minute Apgar scores, hyaline membrane disease, neonatal sepsis/antibiotics use, and admission to the intensive care unit.ResultsThere were 175,112 neonates born between 34 and 36 weeks in 2005. Compared to neonates born between 37 and 40 weeks, neonates born at 34 weeks had higher odds of 5-minute Apgar<7 (adjusted odds ratio [aOR]=5.51, 95% CI [5.16β5.88]), hyaline membranes disease (aOR=10.2 [9.44β10.9]), mechanical ventilation use >6 hours (aOR=9.78 [8.99β10.6]) and antibiotics use (aOR=9.00 [8.43β9.60]). Neonates born at 35 weeks were similarly at risk of morbidity, with higher odds of 5-minute Apgar <7 (aOR 3.42 [3.23β3.63], surfactant use (aOR 3.74 [3.21β4.22], ventilation use >6 hours (aOR 5.53 [5.11β5.99] and NICU admission (aOR 11.3 [11.0β11.7). Further, neonates born at 36 weeks remain at higher risk of morbidity compared to deliveries at 37β40 weeks.ConclusionsWhile the risk of undesirable neonatal outcomes decreases with increasing gestational age, the risk of neonatal complications in late preterm births remains higher compared to infants delivered at 37β40 weeks gestation