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Table 5 Adjusted relative risk of adverse outcomes by gestational age at intervention among women with a propensity score at levels 1 and 2

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

0.95 (0.78–1.15)

0.86 (0.57–1.30)

 

38+0–38+6 vs. ≥ 39+0

0.92 (0.80–1.07)

0.67 (0.47–0.96)

 

39+0–39+6 vs. ≥ 40+0

1.14 (1.01–1.29)

0.89 (0.69–1.16)

Maternal adverse outcome

37+0–37+6 vs. ≥ 38+0

0.79 (0.47–1.34)

1.66 (1.17–2.35)

 

38+0–38+6 vs. ≥ 39+0

1.41 (1.09–1.81)

1.01 (0.77–1.33)

 

39+0–39+6 vs. ≥ 40+0

1.07 (0.84–1.35)

0.86 (0.65–1.13)

Neonatal adverse outcome

37+0–37+6 vs. ≥ 38+0

0.41 (0.16–1.09)

1.69 (0.94–3.05)

 

38+0–38+6 vs. ≥ 39+0

1.10 (0.71–1.70)

1.32 (0.81–2.17)

 

39+0–39+6 vs. ≥ 40+0

0.53 (0.31–0.91)

1.01 (0.62–1.64)

NICU admission

37+0–37+6 vs. ≥ 38+0

1.08 (0.77–1.67)

2.27 (1.61–3.21)

 

38+0–38+6 vs. ≥ 39+0

1.50 (1.14–1.98)

1.61 (1.17–2.19)

 

39+0–39+6 vs. ≥ 40+0

0.74 (0.51–1.05)

1.27 (0.93–1.73)

  

Mean difference (95 % CI, days)b

Mean difference (95 % CI, days)b

Maternal hospital stay

37+0–37+6 vs. ≥ 38+0

1.12 (1.07–1.18)

1.15 (1.10–1.21)

 

38+0–38+6 vs. ≥ 39+0

1.08 (1.04–1.12)

1.10 (1.06–1.14)

 

39+0–39+6 vs. ≥ 40+0

1.17 (1.13–1.20)

1.12 (1.08–1.16)

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