Table 3.

Correlations between Moderate/Severe Fatigue and Selected Variables

Characteristic	r*	p-value
Age	−0.01	0.79
Sex (Male)	−0.09	0.10
Greater than High School (HS) education vs. ≤ HS education	−0.13	0.01
History of tobacco use (> 100 lifetime cigarettes)	−0.02	0.77
FEV1%a	−0.15	0.01
DLCO%b	−0.05	0.35
Video-assisted thoracic surgery only	−0.04	0.50
Presence of cardiac disease	0.04	0.47
Presence of pulmonary disease	0.15	0.01
Current dyspnea (BDIc ≤ 9)	0.20	<0.01
Met physical activity guidelinesd	−0.16	<0.01
Clinically significant symptoms of depressed mood (HADSe ≥ 8)	0.31	<0.01
Clinically significant symptoms of anxious mood (HADS ≥8)	0.22	<0.01

^*For continuous variables r was calculated as point biserial correlation; for categorical variables r was calculated as phi coefficient.

^aFEV1% = Forced Expiratory Volume in 1 second expressed as percent predicted

^bDLCO% = Diffusion Capacity expressed as percent predicted

^cBDI = Baseline Dyspnea Index

^dAmerican College of Sports Medicine and American Heart Association

^eHADS = Hospital Anxiety and Depression Scale