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. 2020 Apr 24;8:191. doi: 10.3389/fped.2020.00191

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Copyright © 2020 Ru, Huang and Feng.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Receiver operating characteristic (ROC) curves of milk output on days 7 and 14 for prediction of milk output > 750 g/d (A) and > 1,000 g/d (B) on day 42. (A) For the cut-off values of 406.8 g/d on day 7 [the area under the curve (AUC) was 0.824; 95% CI was 0.678–0.970; P = 0.008; sensitivity was 68.2%; specificity was 100%] and 518.0 g/d on day 14 (AUC was 0.949; 95% CI was 0.875–1.000; P < 0.001; sensitivity was 81.8%; specificity was 100%) were selected to predict the milk output being more than 750 g/d on day 42. (B) For the cut-off values of 406.8 g/d on day 7 (AUC was 0.851; 95% CI was 0.705–0.996; P = 0.001; sensitivity was 82.4%; specificity was 94.3%) and 600.9 g/d on day 14 (AUC was 0.873; 95% CI was 0.745–1.000; P = 0.001; sensitivity was 88.2%; specificity was 84.6%) were selected to predict the milk output being more than 1,000 g/d on day 42.