Table 1– Results of adapted 6-min walk test in patients previously on and not on oxygen

	Patients on oxygen prior to walk test^#			Patients not on oxygen prior to walk test^¶
	Baseline walk test	Optimal O₂ walk test	p-value	Baseline walk test	Optimal O₂ walk test	p-value
Distance walked m	76.5±66.5	93.4±66.6	0.02	135.0±108.8	216.2±115.0	<0.01
S_p,O₂ %
Pre-walk	94.4±2.1	96.6±1.9	<0.01	94.0±2.0	97.7±1.0	<0.01
Post-walk	77.3±7.6	83.0±6.9	<0.01	80.5±5.5	86.9±3.5	<0.01
Borg score
Pre-walk	1.1±1.5	1.1±1.3	0.22	1.4±1.8	1.1±1.7	0.07
Post-walk	4.8±2.1	4.5±2.2	0.80	4.1±1.7	3.7±2.0	0.13

Data are presented as mean±sd, unless otherwise stated. S_p,O₂: arterial oxygen saturation measured by pulse oximetry.^#: n=41; ^¶: n=29.