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Multivariate Logistic regression analysis on risk factors for death or severe complications in preterm infants <32 weeks. Among the three significant risk factors, PPHN had the highest OR of 4.262, followed by severe asphyxia with an OR of 2.515 and finally gestational age at birth with an OR of 0.637. PPHN, persistent pulmonary hypertension of the newborn; OR, odds ratio; CI, confidence interval.
