Absolute risk difference of adverse birth outcomes in relation to maternal age by log-binomial model.

Reference year of maternal age: 27. * p<0.05. †n = 2,123,751 births; ‡n = 2,045,748 singleton live births. Covariates: (1) composite adverse birth outcome (at least one of stillbirth, preterm birth, low birth weight, congenital anomaly, macrosomia, neonatal death, and SGA): pregnancy-related disorders, obstetric complications, ethnicity, birth region, birth year, parity, sex at birth, Apgar score, and delivery mode; (2) stillbirth: pregnancy-related disorders, obstetric complications, ethnicity, birth region, birth year, sex at birth, parity, congenital anomalies, neonatal death, Apgar score, delivery mode, gestational age, and birth weight; (3) preterm birth: pregnancy-related disorders, obstetric complications, ethnicity, birth region, birth year, sex at birth, parity, congenital anomalies, neonatal death, Apgar score, delivery mode, and birth weight; (4) low birth weight: pregnancy-related disorders, obstetric complications, ethnicity, birth region, birth year, sex at birth, parity, congenital anomalies, neonatal death, Apgar score, delivery mode, and gestational age. Absolute risk difference of adverse birth outcomes in relation to maternal age by log-binomial model.