Describing latent phase duration and associated characteristics among 1281 low-risk women in spontaneous labor

Journal article


Tilden, Ellen L., Phillippi, Julia C., Ahlberg, Mia, King, Tekoa L., Dissanayake, Mekhala, Lee, Christopher S., Snowden, Jonathan M. and Caughey, Aaron B.. (2019) Describing latent phase duration and associated characteristics among 1281 low-risk women in spontaneous labor. Birth. 46(4), pp. 592-601. https://doi.org/10.1111/birt.12428
AuthorsTilden, Ellen L., Phillippi, Julia C., Ahlberg, Mia, King, Tekoa L., Dissanayake, Mekhala, Lee, Christopher S., Snowden, Jonathan M. and Caughey, Aaron B.
Abstract

Background
Recent research suggests that latent phase of labor may terminate at 6 rather than 4 centimeters of cervical dilation. The objectives of this study were to: (a) characterize duration of the latent phase of labor among term, low‐risk, United States women in spontaneous labor using the women's self‐identified onset; and (b) quantify associations between demographic and maternal/newborn health characteristics and the duration of the latent phase.

Methods
This prospective study (n = 1281) described the duration of the latent phase of labor in hours, stratified by parity at the mean, median, and 80th, 90th, and 95th percentiles. The duration of the latent phase was compared for each characteristic using t tests or Wilcoxon rank‐sum tests and regression models that controlled for confounders.

Results
In this sample of predominantly white, healthy women, duration of the latent phase of labor was longer than described in previous studies: The median duration was 9.0 hours and mean duration was 11.8 hours in nulliparous women. The median duration was 6.8 hours and mean duration was 9.3 hours in multiparous women. Among nulliparous women, longer duration was seen in women whose fetus was in a malposition. Among multiparous women, longer durations were noted in women with chorioamnionitis and those who gave birth between 41 and 41 + 6 weeks’ gestation (vs between 40 and 40 + 6 weeks’ gestation).

Conclusions
The latent phase of labor may be longer than previously estimated. Contemporary estimates of latent phase of labor duration will help women and providers accurately anticipate, prepare, and cope during spontaneous labor.

Keywordschorioamnionitis; fetal malposition; labor; labor progress; latent phase of labor; postdates
Year2019
JournalBirth
Journal citation46 (4), pp. 592-601
PublisherWiley-Blackwell Publishing, Inc.
ISSN0730-7659
Digital Object Identifier (DOI)https://doi.org/10.1111/birt.12428
Scopus EID2-s2.0-85063645087
Research or scholarlyResearch
Page range592-601
Publisher's version
License
All rights reserved
File Access Level
Controlled
Output statusPublished
Publication dates
Online18 Nov 2019
Publication process dates
Accepted07 Mar 2019
Deposited13 Apr 2021
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