Gestational age as mediator
Gestational age impacts labour outcomes for SGA pregnancies (14-17) and, thus, was evaluated to determine its impact as an intermediate in this analysis. Gestational age (in completed weeks) was derived from the best obstetrical estimate of the infant’s gestation (18). We analyzed the distribution of gestational age as extremely preterm (21-27 weeks), very preterm (28-31 weeks), moderately preterm (32-33 weeks), late preterm (34-36 weeks), early term (37-38 weeks), term (38-40 weeks), late-term (41 weeks), and post-term (42-44 weeks) (19).