Table 2.

Correlation between dyspnea rating and other variables for O2 users and O2 non-users

	O2 (N = 812)	No O2 (N = 514)
6MWD	−0.28	−016
	<0.0001	0.0003
BMI	0.15	0.14
	<0.0001	0.002
HR baseline	0.07	0.03
	0.04	0.53
HR at 6 min	0.08	0.16
	0.02	0.0003
HR rise	0.02	0.15
	0.49	0.0003
SpO2 baseline	0.03	−0.14
	0.47	0.002
SpO2 at 6 min	−0.19	−0.21
	<0.0001	<0.0001
SpO2 drop	−0.19	−0.17
	<0.0001	<0.0001

Values are correlation coefficient (top) and p value (bottom); BMI body mass index; 6MWD distance walked during six-minute walk test (6MWT); HR heart rate; SpO2 peripheral oxygen saturation; O2 completed 6MWT using supplemental oxygen; 6MWD distance walked during six-minute walk test (6MWT); O2 completed 6MWT using supplemental oxygen; No O2 completed 6MWT without using supplemental oxygen