a decreasing trendP < 0.001
There was a decreasing trend in lung V20 in accordance with severity of emphysema (Jonckheere–Terpstra test, P < 0.001) (Fig. 3 ).
There was a decreasing trend in lung V20 in accordance with severity of emphysema (Jonckheere–Terpstra test, P < 0.001) (Fig. 3 ).
There was an increasing trend in HI in accordance with the severity of emphysema (Jonckheere–Terpstra test, P < 0.001).