Coef (95% CI)	P value	AIC	Coef (95% CI)	P value	AIC
MMRC	0.72 (0.66 to 0.77)	<0.001	4849	0.85 (0.79 to 0.9)	<0.001	4605
SGRQ	13 (12.16 to 13.83)	<0.001	59 145	15.3 (14.5 to 16.14)	<0.001	58 811
Emphysema, %*	8.4 (7.9 to 8.9)	<0.001	24 259	9.79 (9.29 to 10.29)	<0.001	23 892
Gas trapping, %*†	20.2 (19.24 to 21.18)	<0.001	27 241	23 (22 to 23.9)	<0.001	26 738
6-MWD, feet	−137.4 (−152.9 to 121.9)	<0.001	115 774	−172.8 (−188.3 to 157.2)	<0.001	115 608