The relationship between severe maternal morbidity and psychological health symptoms at 6–8 weeks postpartum: a prospective cohort study in one English maternity unit

Table 4 Multivariable logistic regression models: association between severe maternal morbidity and PTSD symptoms (mediation analyses)

		≥20 on IES Intrusion subscale			≥20 on IES Avoidance subscale
		ORs	(95%CI)	P	ORs	(95%CI)	P
Model 1	SMM (unadjusted)
	SMM vs. Non-SMM	2.24	(1.25-4.00)	0.007	3.23	(2.01-5.17)	<0.001
Model 2	SMM (adjusted for potential confounders) ^†
	SMM vs. Non-SMM	2.23	(1.23-4.05)	0.008	3.37	(2.08-5.46)	<0.001
Model 3A	SMM ^†
	SMM vs. Non-SMM	2.04	(1.10-3.75)	0.023	3.14	(1.90-5.16)	<0.001
	Women’s perceived control - LAS^† (unit = 1 score)	0.94	(0.93-0.96)	<0.001	0.95	(0.93-0.96)	<0.001
Model 3B	SMM ^†
	SMM vs. Non-SMM	2.21	(1.22-4.01)	0.009	3.28	(2.02-5.33)	<0.001
	Apgar score at 5 min.^† (unit = 1 score)	0.90	(0.72-1.12)	0.34	0.76	(0.64-0.90)	0.002
Model 3C	SMM ^†
	SMM vs. Non-SMM	2.14	(1.15-3.98)	0.017	2.55	(1.53-4.24)	<0.001
	Mode of birth ^†			Overall 0.69			Overall <0.001
	Assisted vaginal vs. SVD	0.76	(0.40-1.46)	0.42	0.94	(0.52-1.70)	0.83
	Elective CS vs. SVD	0.92	(0.43-1.94)	0.82	1.61	(0.88-2.94)	0.12
	Emergency CS vs. SVD	1.17	(0.68-1.99)	0.57	2.43	(1.56-3.80)	<0.001
Model 3D	SMM ^†
	SMM vs. Non-SMM	2.16	(1.18-3.94)	0.012	3.25	(1.99-5.29)	<0.001
	Place of birth ^†			Overall 0.12			Overall 0.31
	AMU vs. OU	1.05	(0.59-1.85)	0.88	0.93	(0.56-1.53)	0.77
	Planned home vs. OU	--	--	--	0.32	(0.04-2.33)	0.26
	BBA vs. OU	3.26	(1.28-8.33)	0.013	1.97	(0.78-4.98)	0.15

SMM Severe maternal morbidity, LAS Labour Agentry Scale.
^†Adjusted for age, parity, ethnic groups, BMI. The results for these variables have been omitted from Models 2, 3A, 3B, 3C and 3D for simplicity of presentations.
-- There were too few cases of intrusion to calculate the OR.

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