Adjusted* associations between emotional distress (ED†) and gestational length at birth (days).

*adjusted for maternal age, educational level, smoking, pre-pregnancy body mass index, history of spontaneous abortion, late medical risk and neonate gender. For all analyses including ED at 30 weeks, the preterm group is limited to women delivering at 32+0–36+6 week's gestation.†emotional distress at 17 and 30 weeks are dichotomous variables, mean score ≥2 = 1.‡cases with covariates missing are excluded.§compared to no emotional distress at 30 weeks.