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The authors report no conflict of interest.
Institutions involved in the Consortium on Safe Labor are mentioned in the Acknowledgments.
The named authors alone are responsible for the views expressed in this manuscript, which does not necessarily represent the decisions or the stated policy of the Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD), National Institutes of Health (NIH).
The data included in this paper were obtained from the Consortium on Safe Labor, supported by the Intramural Research Program of the NICHD, NIH, through contract number HHSN267200603425C.
This project was funded in part with federal funds (grant number UL1TR000101; previously UL1RR031975) from the National Center for Advancing Translational Sciences , NIH, through the Clinical and Translational Science Awards Program, a trademark of the Department of Health and Human Services, part of the Roadmap Initiative, “Re-Engineering the Clinical Research Enterprise.”
Cite this article as: Kawakita T, Gold SL, Huang JC, et al. Refining the clinical definition of active phase arrest of dilation in nulliparous women to consider degree of cervical dilation as well as duration of arrest. Am J Obstet Gynecol 2021;225:294.e1-14.