Table 3.

Dyspnea and other results for O2 users and O2 non-users among subjects whose nadir SpO2 was < 89 %

	O2 (N = 439)	No O2 (N = 252)	P
6MWD (feet)	1051 ± 382.7	1415.1 ± 370.5	<0.0001
BMI	30.2 ± 6.8	28.8 ± 5.2	0.003
Borg Dyspnea	4.3 ± 2.0	3.4 ± 1.7	<0.0001
Borg Exertion*	3.5 ± 2.1	2.7 ± 1.8	<0.0001
HR baseline	80.4 ± 13.7	78.2 ± 13.3	0.04
HR at 6 min	112.3 ± 16.0	112.9 ± 16.2	0.62
HR rise	31.9 ± 14.8	34.7 ± 15.3	0.02
SpO2 baseline	97.2 ± 2.0	94.6 ± 1.7	<0.0001
SpO2 at 6 min	85.3 ± 3.5	86.0 ± 3.2	0.02
SpO2 drop	11.8 ± 4.1	8.6 ± 3.3	<0.0001

Values are mean and standard deviation; 6MWD distance walked during six-minute walk test (6MWT), O2 completed 6MWT using supplemental oxygen, No O2 completed 6MWT without using supplemental oxygen, SpO2 peripheral oxygen saturation; *N = 355 for O2 users and 204 for non-users