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. 2018 Jan 24;18:14. doi: 10.1186/s12890-018-0576-x

Fig. 3.

Fig. 3

Percentage decrease of capillary PO2 in COPD patients after 1 h of NHF breathing under different experimental conditions. ** = p > 0.05 vs. baseline; baseline PCO2 > 55 mmHg, a: n = 14, b: n = 11, c: n = 9, d: n = 9