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Table 5 Sensitivity analysis for stillbirths in women who were lost-to-follow-up

From: The association between timing of initiation of antenatal care and stillbirths: a retrospective cohort study of pregnant women in Cape Town, South Africa

  Model 1 Model 2 Model 3 Model 4
aOR (95% CI) aOR (95% CI) aOR (95% CI) aOR (95% CI)
Number of observations 34,671 34,671 34,671 34,671
Number of stillbirths in women lost-to-follow up 0 28 140 279
Total number of stillbirths 119 147 259 398
Gestational age at first ANC visit (Continuous) 1.02 (0.99-1.05) 1.00 (0.98-1.03) 1.00 (0.98-1.02) 0.98 (0.96-0.99)a
Gestational age at first ANC visit (Trimesters)     
1 st Trimester (ref) 1.00 1.00 1.00 1.00
2 nd Trimester 0.87 (0.43-1.76) 0.81 (0.45-1.45) 0.82 (0.53-1.28) 0.60 (0.44-0.82)a
3 rd Trimester 1.20 (0.58-2.47) 0.96 (0.52-1.78) 0.94 (0.59-1.50) 0.55 (0.39-0.78)a
  1. Models 1, 2, 3, and 4 display scenarios where the assumed stillbirth rate in women who were lost-to-follow-up are: 0 per 1,000, 4 per 1,000, 20 per 1,000, and 40 per 1,000, respectively. All models are adjusted for parity, education, mother’s age, race, and smoking status.
  2. aOR, Adjusted Odds Ratio.
  3. aIndicates a significant aOR at 5% significance.