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Table 4 Adjusted relative risk of adverse outcomes by gestational age at intervention among women with a propensity score at levels 3 and 4

From: Preventive induction of labor for non-urgent indications at term and maternal and neonatal outcomes

Adverse outcome

Gestational age at induction/delivery

Nulliparas RR (95 % CI)a

Multiparas RR (95 % CI)a

Cesarean delivery

37+0–37+6 vs. ≥ 38+0

0.80 (0.67–0.97)

0.42 (0.26–0.65)

 

38+0–38+6 vs. ≥ 39+0

0.83 (0.73–0.95)

0.65 (0.49–0.87)

 

39+0–39+6 vs. ≥ 40+0

0.95 (0.84–1.08)

0.96 (0.66–1.39)

Maternal adverse outcome

37+0–37+6 vs. ≥ 38+0

0.69 (0.39–1.23)

1.25 (0.73–2.14)

 

38+0–38+6 vs. ≥ 39+0

1.09 (0.76–1.55)

0.93 (0.63–1.36)

 

39+0–39+6 vs. ≥ 40+0

1.39 (1.07–1.81)

1.02 (0.82–1.26)

Neonatal adverse outcome

37+0–37+6 vs. ≥ 38+0

1.68 (0.97–2.92)

2.22 (1.32–3.74)

 

38+0–38+6 vs. ≥ 39+0

0.57 (0.30–1.10)

0.89 (0.49–1.63)

 

39+0–39+6 vs. ≥ 40+0

0.75 (0.44–1.26)

1.79 (1.08–2.98)

NICU admission

37+0–37+6 vs. ≥ 38+0

1.48 (0.99–2.20)

2.08 (1.47–2.96)

 

38+0–38+6 vs. ≥ 39+0

0.52 (0.32–0.84)

0.89 (0.60–1.34)

 

39+0–39+6 vs. ≥ 40+0

0.87 (0.61–1.24)

1.47 (1.02–2.12)

  

Mean difference (95 % CI, days)b

Mean difference (95 % CI, days)b

Maternal hospital stay

37+0–37+6 vs. ≥ 38+0

1.07 (1.02–1.12)

1.13 (1.09–1.18)

 

38+0–38+6 vs. ≥ 39+0

1.04 (1.01–1.08)

1.06 (1.03–1.10)

 

39+0–39+6 vs. ≥ 40+0

1.07 (1.03–1.10)

1.11 (1.08–1.14)

  1. alog binomial model adjusting for propensity score. bleast squares mean difference adjusting for propensity score