Prevalence of Prolonged Latent Phase and Labor Outcomes: Review of Birth Records in a Swedish Population.

Based on women's self-report, the prevalence of a prolonged latent phase in women at term who planned a vaginal birth and had spontaneous onset of labor was higher than previously reported. Women with a prolonged latent phase were more likely to receive obstetric interventions. Assisted vaginal birth was more common for nulliparous women with prolonged latent phase and emergency cesarean occurred more frequently for both nulliparous women and multiparous women with a prolonged latent phase.