AORs were obtained by controlling for the effects of gravidity, parity, body mass index, history of spontaneous abortion, history of in vitro fertilization, and
pre-existing medical conditions.
Referent used was the group including all patients aged 20e29 years at delivery.
Reference for the determination of SGA and LGA: 12.
AOR ¼ adjusted odds ratio; CI ¼ confidence interval; LGA ¼ large for gestational age; SGA ¼ small for gestational age.