Table 6.

Linear regression models showing association between dyspnea ratings and other variables

	Model 1	Model 2	Model 3	Model 4	Model 5
Intercept	2.50 ± 0.10	3.31 ± 0.26	3.24 ± 0.27	5.37 ± 0.31	1.96 ± 0.36
	<0.0001	<0.0001	<0.0001	<0.0001	<0.0001
Used O2	0.77 ± 0.11	0.66 ± 0.12	0.68 ± 0.12	0.42 ± 0.13	0.54 ± 0.12
	<0.0001	<0.0001	<0.0001	0.001	<0.0001
BMI					0.05 ± 0.01
					<0.0001
SpO2 drop	0.07 ± 0.01	0.06 ± 0.01	0.06 ± 0.01		0.06 ± 0.01
	<0.0001	<0.0001	<0.0001		<0.0001
FVC%		−0.01 ± 0.003	−0.01 ± 0.003	−0.01 ± 0.0002	−0.01 ± 0.002
		0.001	0.001	0.008	<0.0001
6MWD				−0.001 ± 0.002
				<0.0001
HR rise			0.003 ± 0.004
			0.43
R-square	0.09	0.09	0.09	0.11	0.11

Values are coefficients and standard error (top) and p value (bottom); 6MWD distance walked during six-minute walk test (6MWT), O2 completed 6MWT using supplemental oxygen, No O2 completed 6MWT without using supplemental oxygen, HR heart rate, SpO2 peripheral oxygen saturation