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Eventual vaginal delivery rates of women remaining in latent phase. A. Nulliparous women (n=9,763); B. Multiparous women (n=8,379). X-axis displays the duration of oxytocin and rupture of membranes. P-values for both nulliparous and multiparous women were both P <.001 (Cochran-Armitage Trend Test). % (number of women in the latent phase divided by all women).
