Table 2.

Correlation matrix of clinical severity variables

	PaO2 (mm Hg)	PaCO2 (mm Hg)	6-min walk distance (m)	OCD score	BDI score	Post-BD FVC% pred	Post-BD FEV1% pred
PaO2 (mm Hg)	1
PaCO2(mm Hg)	−0.68**	1
6-min walk distance (m)	0.29*	−0.27*	1
OCD score	0.50**	−0.52**	0.20	1
BDI score	0.50**	−0.52**	−0.02	0.67**	1
Post-BD FVC % pred	0.33*	−0.34*	0.34**	0.5	0.08	1
Post-BD FEV1 % pred	0.48**	−0.46**	0.41**	0.23*	0.22*	0.7**	1

Spearman's rho

^*: P <.05;

^**: P <.01