Bland-Altman analysis of the end-tidal carbon dioxide concentration (PETCO2) during resting (A), with mouth closed (B), and during deep breathing (C) while.

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Bland-Altman analysis of the end-tidal carbon dioxide concentration (PETCO2) during resting (A), with mouth closed (B), and during deep breathing (C) while administering oxygen supplementation at 4 L/min. Bland-Altman analysis of the end-tidal carbon dioxide concentration (PETCO2) during resting (A), with mouth closed (B), and during deep breathing (C) while administering oxygen supplementation at 4 L/min. The biases ± SD (limits of agreement) were 14.8 ± 8.2 (−1.3 to 30.9) for PETCO2 during resting, 10.2 ± 6.4 (−2.3 to 22.7) for PETCO2 with mouth closed, and 7.7 ± 5.6 (−3.2 to 18.6) for PETCO2 during deep breathing. Shunsuke Takaki et al. Respir Care 2017;62:86-91 (c) 2012 by Daedalus Enterprises, Inc.