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. Author manuscript; available in PMC: 2020 Dec 1.
Published in final edited form as: Birth. 2019 Mar 28;46(4):592–601. doi: 10.1111/birt.12428

Table II.

Duration of latent phase labor among low-risk women in spontaneous labor at term, CNM Database, Portland, OR, 2012-2017

Nulliparous Multiparous
Point of distribution Duration latent phase (hours) Number of women continuing latent phase beyond identified point of distribution (n) Duration latent phase (hours) Number of women continuing latent phase beyond identified point of distribution (n)
50%/median 9.0 305 6.8 287
mean 11.8 220 9.3 254
80% 17.0 124 13.5 116
90% 24.0 62 19.0 59
95% 30.0 31 24.5 29