Table 2 Odds ratios for low neonatal Apgar scores and foetal acidosis in nulliparous and multiparous participants with 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

 

Apgar scores < 7 at 1 min after birth

Apgar scores < 7 at 5 min after birth

UmA-pH < 7.2

UmA-pH < 7.1

Odds ratios (95% CI)

Nulliparous

LD < 10 h, N = 6597

Ref

Ref

Ref

Ref

LD ≥ 10 h, N = 5844

 cORs

1.17 (0.83–1.64)

1.49 (0.82–2.70)

1.43 (1.25–1.63)

1.46 (1.06–2.02)

 aORs

1.22 (0.86–1.72)

1.54 (0.84–2.81)

1.43 (1.25–1.63)

1.42 (1.02–1.96)

Multiparous

LD < 5 h, N = 13,342

Ref

Ref

Ref

Ref

LD ≥ 5 h, N = 11,899

 cORs

1.21 (0.91–1.60)

1.08 (0.64–1.84)

1.18 (1.05–1.33)

1.28 (0.95–1.72)

 aORs

1.22 (0.92–1.62)

1.04 (0.61–1.77)

1.19 (1.05–1.34)

1.32 (0.98–1.78)

  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; cORs, crude odds ratios; LD, labour duration; Ref, reference; UmA, umbilical artery.
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