Table 3.

Linear regression showing candidate predictors of steps per day

	Univariate Beta ± S.E.	P	Multivariate Model 1** Beta ± S.E.	P	Multivariate Model 2** Beta ± S.E	P
Intercept			10,416 ± 1720	<0.0001	9285 ± 1269	<0.0001
Male gender	−674.0 ± 389.9	0.08
Age	−37.4 ± 19.9	0.06	−47.8 ± 18.4	0.01	−46.0 ± 17.9	0.01
BMI	−56.7 ± 28.4	0.04	−32.8 ± 26.8	0.22
IPF diagnosis	−16.5 ± 423.4	0.97
FVC%*	5.1 ± 13.5	0.71
DLCO%*	34.4 ± 14.4	0.01	20.4 ± 12.2	0.09
Number of comorbidities	−391.8 ± 165.6	0.01
FSS	−59.1 ± 11.3	<0.0001	−51.5 ± 11.7	<0.0001
LCQ	160.7 ± 53.2	0.002
UCSD	−33.3 ± 9.8	0.0008			−40.6 ± 9.1	<0.0001
SF-36
PF	89.1 ± 17.9	<0.0001
RP	64.5 ± 15.4	<0.0001
BP	60.8 ± 19.3	0.001
GH	73.8 ± 18.3	<0.0001
VT	70.0 ± 16.8	<0.0001
SF	65.7 ± 17.9	0.0003
RE	45.9 ± 14.8	0.002
MH	37.5 ± 20.8	0.07
Wrist accelerometer	2881.4 ± 484.8	<0.0001	2974.6 ± 477.6	<0.0001	2993.8 ± 460.7	<0.0001
Enrolled in winter	19.5 ± 464.9	0.97
Lives in Colorado	−298.2 ± 406.4	0.46
Employed outside home	410.0 ± 423.5	0.33
Adjusted R-square			0.34		0.27

Footnote: *Within 120 days of enrollment; **Backward selection of candidate variables that included male gender, age, body mass index (BMI), percent predicted diffusion capacity of the lung for carbon monoxide (DLCO%), number of comorbid conditions, wrist vs. waist accelerometer wear, and fatigue (Model 1) or dyspnea (Model2); FVC% = percent predicted forced vital capacity; UCSD = University of California San Diego Shortness of Breath Questionnaire; FSS = Fatigue Severity Survey; LCQ = Leicester Cough Questionnaire; SF-36 = Medical Outcomes Study Short-Form 36-item Questionnaire; PF = Physical Functioning; RP = Role Physical; BP = Bodily Pain; GH = General Health; SF = Social Functioning; VT = Vitality; RE = Role Emotional; MH = Mental Health