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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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Nomogram for predicting total exacerbation in patients with stable COPD. To use the nomogram for predicting each individual patient's exacerbation risk, first we locate the range of each variable on the horizontal scale and draw a line vertically to the bottom score line to determine the corresponding points. Then, we sum up the points of all three variables and locate the total score on the total score scale. Finally, we draw a vertical line from the dot on the total sore line to the upward risk probability line to calculate the risk of exacerbation.