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

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

   ≥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
  1. SMM Severe maternal morbidity, LAS Labour Agentry Scale.
  2. 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.
  3. -- There were too few cases of intrusion to calculate the OR.