Table 1.

Baseline characteristics for O2 users and O2 non-users with fILDs

	O2 (N = 812)	No O2 (N = 514)	P-
Age (years)	68.3 ± 10.5	66.6 ± 11.0	0.004
Female (%)	327 (40.3)	211 (41.1)	0.78
Smoking*	4 (0.6 %)	3 (0.6 %)	0.003
Present	471 (65.9 %)	277 (57.4 %)
Past	240 (33.6 %)	203 (42.0 %)
Never
BMI	30.3 ± 6.9	28.5 ± 5.5	<0.0001
IPF diagnosis (%)	303 (37.3)	170 (33.1)	0.12
FVC% within 30 days**	61.3 ± 18.9	77.5 ± 17.4	<0.0001
DLCO% within 30 days***	37.5 ± 12.8	56.1 ± 16.5	<0.0001
6MWD (feet)	1070.6 ± 361.4	1421.4 ± 343.7	<0.0001
Borg Dyspnea	3.9 ± 2.0	2.9 ± 1.7	<0.0001
Borg Exertion****	3.2 ± 2.1	2.4 ± 1.8	<0.0001
HR baseline	79.7 ± 13.9	78.1 ± 13.2	0.03
HR at 6 min	109.7 ± 15.9	110.9 ± 15.8	0.18
HR rise	30.0 ± 14.5	32.8 ± 13.7	0.0004
SpO2 baseline	97.4 ± 1.9	95.2 ± 1.7	<0.0001
SpO2 at 6 min	88.1 ± 5.3	88.7 ± 5.4	0.04
SpO2 drop	9.2 ± 5.5	6.4 ± 5.2	<0.0001

Values are mean and standard deviation or count (percent); IPF idiopathic pulmonary fibrosis; BMI body mass index; FVC% percent predicted forced vital capacity; DLCO% percent predicted diffusing capacity of the lung for carbon monoxide; 6MWD distance walked during six-minute walk test (6MWT); SpO2 peripheral oxygen saturation; HR heart rate; O2 completed 6MWT using supplemental oxygen; No O2 completed 6MWT without using supplemental oxygen; *N = 715 for O2 users and 483 for non-users; **N = 446 for O2 users and 251 for non-users; ***N = 211 for O2 users and 123 for non-users; ****N = 672 for O2 users and 415 for non-users