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Data of 37,682 women with full-term singleton spontaneous vaginal deliveries from the Japan Environment and Children\u2019s Study were analysed. Women were classified according to the median LD as nulliparous (&lt;\u200910 or\u2009\u2265\u200910\u00a0h) or multiparous (&lt;\u20095 or\u2009\u2265\u20095\u00a0h) and further into five subcategories: nulliparous (&lt;\u200910.0, 10.0\u201312.9, 13.0\u201315.9, 16.0\u201318.9, and\u2009\u2265\u200919\u00a0h) and multiparous (&lt;\u20095.0, 5.0\u20137.9, 8.0\u201310.9, 11.0\u201313.9, and\u2009\u2265\u200914.0\u00a0h). Multiple logistic regression models were used to determine odds ratios (ORs) for outcomes in women with over-median LD. Over-median LD exhibited no statistically significant association with low neonatal Apgar scores. The adjusted ORs for both umbilical artery (UmA-pH)\u2009&lt;\u20097.2 and\u2009&lt;\u20097.1 were increased in nulliparous women with over-median LD, whereas only the adjusted OR for UmA-pH\u2009&lt;\u20097.2 was increased in multiparous women with over-median LD. 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