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Table 2 Odds ratio of stillbirth

From: Abnormal placental perfusion and the risk of stillbirth: a hospital-based retrospective cohort study

Characteristics All (56 cases) Unexplained (48 cases)
Raw odds ratio (95% CI) P value Adjusted odds ratio (95% CI) P value Raw odds ratio (95% CI) P value Adjusted odds ratio (95% CI) P value
Placental perfusion
 Normal 1.0   1.0   1.0   1.0  
 Insufficiency 4.8 (2.5–9.1) < 0.001 4.2 (2.2–8.0) < 0.001 5.3 (2.7–10.5) < 0.001 4.6 (2.3–9.2) < 0.001
 NA 1.7 (0.9–3.2) 0.10 1.6 (0.9–3.1) 0.13 1.6 (0.8–3.3) 0.16 1.6 (0.8–3.1) 0.21
Maternal age at delivery (years)
  < 25 1.0   1.0   1.0   1.0  
 25–34 0.9 (0.3–3.0) 0.91 0.9 (0.3–2.9) 0.86 0.8 (0.2–2.5) 0.67 0.7 (0.2–2.4) 0.60
  ≥ 35 1.0 (0.3–4.1) 0.98 0.8 (0.2–3.4) 0.77 1.0 (0.3–4.1) 0.98 0.8 (0.2–3.3) 0.71
Residence
 Local 1.0   1.0   1.0   1.0  
 Nonlocal 1.1 (0.6–2.0) 0.74 1.1 (0.6–2.0) 0.81 1.1 (0.6–2.1) 0.75 1.1 (0.5–2.1) 0.85
Parity
 Nulliparous 1.0   1.0   1.0   1.0  
 Pluriparous 1.2 (0.6–2.4) 0.57 1.3 (0.6–2.7) 0.51 1.3 (0.6–2.7) 0.49 1.3 (0.6–2.9) 0.48
Assisted conception
 No 1.0   1.0   1.0   1.0  
 Yes 1.0 (0.1–7.2) 0.99 0.9 (0.1–6.9) 0.94 1.2 (0.2–8.4) 0.88 1.0 (0.1–7.8) 0.98
Gestational diabetes mellitus
 No 1.0   1.0   1.0   1.0  
 Yes 1.1 (0.4–2.7) 0.89 0.9 (0.4–2.4) 0.87 1.3 (0.5–3.2) 0.62 1.1 (0.4–2.8) 0.88
Preeclampsia
 No 1.0   1.0   1.0   1.0  
 Yes 4.5 (2.4–8.6) < 0.001 3.8 (2.0–7.4) < 0.001 4.9 (2.5–97) < 0.001 4.0 (2.0–8.1) < 0.001
Sex
 Male 1.0   1.0   1.0   1.0  
 Female 1.9 (1.1–3.3) 0.020 1.9 (1.1–3.3) 0.020 1.9 (1.1–3.5) 0.028 2.0 (1.1–3.5) 0.027