Fig. 3

The multivariable-adjusted hazard ratios for exacerbation by the levels of diffusion capacity or transfer coefficient of the lung. HR, hazard ratio. With regard to diffusing capacity, the preserved and low groups consisted of subjects with D_LCO % pred ≥ 80% and < 80%, respectively. Similarly, the preserved-K_CO and low-K_CO group indicated subjects with K_CO % pred < 80% and ≥ 80%, respectively