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The risk of neonatal respiratory morbidity between indicated deliveries vs. spontaneous deliveries has not been consistent in previous studies, in spite of the traditional belief that chronic intrauterine stress might have protective effect on fetal lung maturation. We hypothesized that the heterogeneous etiology of indicated preterm delivery may obscure the relationship between the etiologies of preterm birth and neonatal respiratory morbidity. To address this issue, we divided the indicated preterm birth (PTB) into medically-indicated (without fetal compromise) PTB and maternal/fetal-indicated PTB, and compared the neonatal respiratory morbidity according to the etiology of late PTB.

The risk of neonatal respiratory morbidity according to the etiology of late preterm delivery