Table 2. Adjusted^* associations between emotional distress (ED^†) and gestational length at birth (days).

	Non-stratified analyses	Stratified for preterm and term birth
		Preterm<37 weeks n = 1,787‡	Term ≥37 weeks n = 33,386‡
	Coefficient	Coefficient	Coefficient
	(95% CI)	(95% CI)	(95% CI)
ED at 17 weeks and spontaneous start of birth	n = 29,993	n = 1,275	n = 28,718
	−0.15 (−0.72; 0.42) P = 0.615	1.00 (−2.74; 4.73) P = 0.600	−0.34 (−0.73; 0.06) P = 0.097
ED at 17 weeks and provider-initiated start of birth	n = 5,180	n = 512	n = 4,668
	−0.15 (−0.72; 0.42) P = 0.615	1.00 (−2.74; 4.73) P = 0.600	−0.34 (−0.73; 0.06) P = 0.097
ED at 30 weeks and spontaneous start of birth	n = 27,748	n = 1,042	n = 26,706
	−0.07 (−1.15; 1.01) P = 0.899	−1.78 (−3.68; 0.13) P = 0.068	0.003 (−1.07; 1.08) P = 0.996
ED at 30 weeks and provider-initiated start of birth	n = 4,668	n = 366	n = 4,302
	−2.32 (−3.54; −1.09) P<0.001	−1.78 (−3.68; 0.13) P = 0.068	−2.40 (−3.40; −1.39) P<0.001
Increase in ED and spontaneous start of birth§	n = 27,104	n = 1,016	n = 26,088
	0.37 (−0.61; 1.36) P = 0.456	−2.34 (−4.73; 0.05) P = 0.055	0.51 (−0.55; 1.58) P = 0.346
Increase in ED and provider-initiated star of birth§	n = 4,531	n = 358	n = 4,173
	−2.54 (−4.09; −0.99) P = 0.001	−2.34 (−4.73; 0.05) P = 0.055	−2.13 (−3.41; −0.85) P = 0.001
Sustained high ED and spontaneous start of birth§	n = 26,862	n = 1,006	n = 25,856
	−0.93 (−1.73; −0.13) P = 0.022	−0.83 (−3.84; 2.18) P = 0.589	−0.72 (−1.69; 0.25) P = 0.145
Sustained high ED and provider-initiated start of birth§	n = 4,459	n = 348	n = 4,111
	−0.93 (−1.73; −0.13) P = 0.022	−0.83 (−3.84; 2.18) P = 0.589	−2.82 (−4.37; −1.27) P<0.001

*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.