Table 3 Adjusted odds ratios for foetal acidosis in nulliparous and multiparous women with each labour duration category in over-median labour duration.

From: Association of labour duration in spontaneous deliveries with low neonatal Apgar scores and foetal acidosis: the Japan Environment and Children’s Study

 

UmA-pH < 7.2

UmA-pH < 7.1

aORs (95% CI)

Nulliparous

LD < 10.0 h, N = 6597

Ref

Ref

LD 10.0–12.9 h, N = 2064

1.26 (1.04–1.52)

1.24 (0.78–1.97)

LD 13.0–15.9 h, N = 1349

1.53 (1.24–1.89)

1.53 (0.93–2.51)

LD 16.0–18.9 h, N = 833

1.47 (1.14–1.90)

1.53 (0.84–2.79)

LD ≥ 19.0 h, N = 1598

1.54 (1.27–1.87)

1.49 (0.93–2.38)

Multiparous

LD < 5.0 h, N = 13,342

Ref

Ref

LD 5.0–7.9 h, N = 6900

1.15 (0.99–1.32)

1.17 (0.82–1.68)

LD 8.0–10.9 h, N = 2788

1.27 (1.05–1.53)

1.23 (0.75–2.02)

LD 11.0–13.9 h, N = 1239

1.43 (1.10–1.85)

2.42 (1.43–4.11)

LD ≥ 14.0 h, N = 972

0.99 (0.71–1.38)

1.27 (0.58–2.76)

  1. Maternal age, pre-pregnancy body mass index, gestational weight gain, maternal smoking status, maternal alcohol consumption status, maternal educational status, annual household income, neonatal birth weight, and presence of hypertensive disorders of pregnancy were used as confounding factors.
  2. aORs, adjusted odds ratios; CI, confidence interval; LD, labour duration; Ref, reference; UmA, umbilical artery.
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