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. 2020 Dec 9;7:572435. doi: 10.3389/fmed.2020.572435

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Copyright © 2020 Liu, Ge, Feng, Hang, Zhang, Jin, Bao, Zhou, Han, Li, Qian, Jie, Gu, Gao, Yu, Wang, Ji, Zhang and Zhu.

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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Calibration curve of combined indexes (PLR, sex, COPD years, and SGRQ scores) to predict total exacerbation of COPD patients. Result of Hosmer–Lemeshow fitness test: χ² = 6.37, P = 0.606.