Long-term outcomes of children with neonatal transfer: the Japan Environment and Children’s Study

This study aimed to evaluate the association of neonatal transfer with the risk of neurodevelopmental outcomes at 3 years of age. Data were obtained from the Japan Environment and Children’s Study. A general population of 103,060 pregnancies with 104,062 fetuses was enrolled in the study in 15 Regional Centers between January 2011 and March 2014. Live-born singletons at various gestational ages, including term infants, without congenital anomalies who were followed up until 3 years were included. Neurodevelopmental impairment was assessed using the Ages and Stages Questionnaire, third edition (ASQ-3) at 3 years of age. Logistic regression was used to estimate the adjusted risk and 95% confidence interval (CI) for newborns with neonatal transfer. Socioeconomic and perinatal factors were included as potential confounders in the analysis. Among 83,855 live-born singletons without congenital anomalies, 65,710 children were studied. Among them, 2780 (4.2%) were transferred in the neonatal period. After adjustment for potential confounders, the incidence of neurodevelopmental impairment (scores below the cut-off value of all 5 domains in the ASQ-3) was higher in children with neonatal transfer compared with those without neonatal transfer (communication: 6.5% vs 3.5%, OR 1.42, 95% CI 1.19–1.70; gross motor: 7.6% vs 4.0%, OR 1.26, 95% CI 1.07–1.49; fine motor: 11.3% vs 7.1%, OR 1.19, 95% CI 1.03–1.36; problem solving: 10.8% vs 6.8%, OR 1.29, 95% CI 1.12–1.48; and personal-social: 6.2% vs 2.9%, OR 1.52, 95% CI 1.26–1.83). Conclusion: Neonatal transfer was associated with a higher risk of neurodevelopmental impairment at 3 years of age. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s00431-022-04450-7.