Table 2.

Pearson product-moment correlation coefficients for associations between outcome measures

	FVC%	DLCO%	6MWD	BDI	TrailsA	TrailsB	WMVP1	WMVP2	DVtime	DVerror	Animal	Clock	GAD	PHQ	FSS	PSQI
FVC%	1.0	0.44	0.44	0.22	−0.11	0.10	0.33	0.24	0.33	−0.16	−0.11	0.31	−0.34	−0.25	−0.11	−0.54*
DLCO%	-	1.0	0.28	0.17	−0.30	−0.003	0.32	0.10	−0.21	−0.13	−0.29	0.46	−0.48	−0.18	−0.24	−0.42
6MWD	-	-	1.0	0.65†	0.57*	0.53*	−0.07	−0.01	0.41	0.47*	−0.04	0.46	−0.04	−0.32	−0.57*	−0.37
BDI				1.0	0.35	0.47*	−0.36	−0.22	0.55†	0.34	−0.33	0.13	−0.12	−0.26	−0.54*	−0.10
TrailsA	-	-	-	-	1.0	0.4*	0.002	0.12	0.46*	0.52*	0.22	0.30	−0.95	−0.25	−0.43*	−0.07
TrailsB	-	-	-	-	-	1.0	−0.22	−0.02	0.35	0.19	−0.08	0.23	−0.15	−0.30	−0.30	−0.35
WMVP1	-	-	-	-		-	1.0	0.87‡	−0.19	−0.15	0.37	0.38	−0.51*	−0.26	−0.01	−0.09
WMVP2	-	-	-	-		-	-	1.0	0.01	0.13	0.42	0.42	−0.47*	−0.34	−0.008	−0.04
DVtime	-	-	-	-		-	-	-	1.0	0.40	0.06	0.21	−0.18	−0.35	−0.34	−0.13
DVerror	-	-	-	-		-	-	-	-	1.0	0.07	0.16	0.15	−0.10	−0.32	0.09
Animal	-	-	-	-		-	-	-	-	-	1.0	0.31	−0.24	−0.17	0.10	0.23
Clock	-	-	-	-		-	-	-	-	-	-	1.0	−0.40	−0.67†	−0.21	−0.17
GAD	-	-	-	-		-	-	-	-	-	-	-	1.0	0.59†	0.38	0.29
PHQ														1.0	0.53*	0.59†
FSS															1.0	0.37
PSQI																1.0

^*p<0.05

^†p<0.01

^‡p<0.0001

FVC%=percent predicted forced vital capacity; DLCO%=percent predicted diffusing capacity of the lung for carbon monoxide, 6MWD=distance walked during the six-minute walk test; BDI=Baseline Dyspnea Index; TrailsA=Trail Making Test Form A; TrailsB=Trail Making Test Form B; WMVP1=Wechsler Memory Scales-Third Edition Verbal Pairs 1; WMVP2=Wechsler Memory Scales-Third Edition Verbal Pairs 2; DVtime=Digit Vigilance Test Time; DVerror=Digit Vigilance Test Errors; Animal=Animal Fluency Test; Clock=Clock Drawing Test; GAD=General Anxiety Questionnaire; PHQ=Patient Health Questionnaire (8 items); FSS=Fatigue Severity Scale; PSQI=Total score from the Pittsburgh Sleep Quality Index