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

In under-median LD, there was a partially significant association between the divided categories, decreased incidence of low neonatal Apgar scores at 5 min and foetal acidosis in nulliparous women, and only UmA-pH < 7.2 in multiparous women without dose–response association (data not shown).

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