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Table 3 Final model of the stepwise regression analysis

From: Risk-adjusted cesarean section rates for the assessment of physician performance in Taiwan: a population-based study

Risk factor   Model 1* Model 2*
   Crude OR (95% CI) Adj. OR (95% CI) Adj. OR (95% CI)
Multiple gestation   8.5 (7.9–9.1) 12.4 (11.5–13.5) 11.7 (10.7–12.8)
Multiparous   1.1 (1.1–1.2) 0.4 (0.4–0.4) 0.4 (0.4–0.4)
Gestation period (weeks) < 37 1.9 (1.8–2.0) - -
  ≥ 42 1.1 (0.9–1.3) 2.2 (1.8–2.7) 2.4 (1.9–2.9)
Maternal age (years) < 20 0.4 (0.4–0.5) 0.6 (0.5–0.6) 0.6 (0.5–0.6)
  ≥ 35 2.2 (2.1–2.2) 1.9 (1.9–2.0) 1.9 (1.8–2.0)
Malpresentation   206.8 (175.4–243.8) 468.0 (396.6–552.3) 481.2 (404.3–572.8)
Prolapsed cord   24.5 (9.9–60.7) 61.7 (24.4–156.1) 107.0 (32.9–347.9)
Antepartum hemorrhage, abruptio placenta, and previa placenta   35.3 (30.0–41.6) 95.6 (81.0–112.8) 86.9 (72.5–104.2)
Previous CS history   100.8 (92.6–109.7) 291.0 (266.6–317.7) 287.2 (261.6–315.3)
Insufficient or excessive fetal growth   6.9 (6.0–7.9) 13.1 (11.4–15.2) 13.0 (11.0–15.2)
Genital herpes   5.0 (3.0–8.2) 10.4 (6.1–17.7) 8.0 (4.4–14.5)
Diabetes mellitus   2.4 (2.1–2.8) 3.1 (2.5–3.7) 2.8 (2.3–3.5)
Anemia   2.9 (2.7–3.1) 3.6 (3.2–4.0) 3.3 (2.9–3.7)
Cardiac disease   3.2 (2.2–4.6) 6.0 (4.0–9.0) 5.1 (3.2–8.3)
Arterial hypertension   2.8 (2.4–3.3) 4.4 (3.7–5.3) 4.4 (3.6–5.4)
Eclampsia/preeclampsia   8.2 (7.2–9.4) 15.4 (13.4–17.8) 14.6 (12.5–17.1)
Polyhydramnios/oligohydramnios   2.5 (2.1–3.1) 3.5 (2.7–4.4) 3.7 (2.8–4.8)
Infection of amniotic cavity   6.5 (5.0–8.6) 11.3 (8.5–15.1) 11.5 (8.3–16.0)
Congenital/acquired abnormality of cervix or vagina   9.8 (4.6–20.8) 19.8 (8.9–44.0) 19.6 (8.7–44.6)
Premature labor   1.6 (1.5–1.7) 1.5 (1.4–1.6) 1.6 (1.4–1.7)
Premature rupture of the membrane   0.8 (0.8–0.9) 1.4 (1.3–1.5) 1.4 (1.3–1.5)
Cervical incompetence   1.8 (1.2–2.8) 2.8 (1.7–4.6) -
  1. Note: * OR, odds ratio; CI, confidence interval.