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. 2017 Jan 10;17:18. doi: 10.1186/s12884-016-1189-0

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© The Author(s). 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 3 — Classification and Regression Tree model for predicting ePTB. Legend: The probability of ePTB (P) and the number of subject (N) are all given inside of each node for both training and validation cohort. In each end node, the subgroup birth prevalence (SBP) is also calculated. AI = American Indian; AN = Alaskan Native; PI = Pacific Islander