Table 3.

Contributions of demographic and clinical variables to sedentary time and different levels of physical activity based on multiple regression analysis in people with COPD (n = 224).

	R2	Unstandardized beta	df	F	p
A) Dependent variable was mean activity intensity (log mean activity intensitya)
Overall model	33.3		9, 22	10.49	0.00001
Age		−0.03			0.0001
Race		0.16			0.08
Marital status		−0.06			0.39
Income level		−0.03			0.62
Working status		−0.21			0.12
Self-reported health		−0.43			0.001
Body mass index		−0.01			0.03
Shortness of breath		−0.17			0.08
Number of comorbidity		−0.05			0.89
B) Dependent variable was sedentary time (minutes/day)
Overall model	21.7		7, 24	10.06	0.00001
Age		3.05			0.08
Race		−77.95			0.01
Marital status		12.37			0.52
Income level		30.71			0.11
Level of education		45.04			0.01
Working status		101.65			0.001
Shortness of breath		74.48			0.003
C) Dependent variable was time spent in light physical activity (minutes/day)
Overall model	29.4		9, 22	5.63	0.001
Age		−2.14			0.01
Gender		38.76			0.002
Race		10.73			0.45
Marital status		−16.67			0.19
Working status		−31.74			0.23
Self-reported health		−71.15			0.001
Body mass index		−2.19			0.04
Shortness of breath		−10.40			0.60
Number of comorbidity		−4.82			0.20
D) Dependent variable was time spent in moderate to vigorous physical activity (log minutes/day)
Overall model	30.5		9, 22	20.32	0.0001
Age		−0.06			0.0001
Gender		−0.32			0.03
Marital		−0.14			0.77
Level of education		0.13			0.38
Working status		−0.28			0.34
Self-reported health		−0.73			0.001
Shortness of breath		−0.42			0.05
Number of comorbidity		0.01			0.93

^aMean activity intensity means mean total counts/total wear time (minute).