Comparison 1. Ambulatory oxygen versus air.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Six‐minute walk distance (m)	1		Mean Difference (Fixed, 95% CI)	13.0 [‐36.58, 62.58]
2 Endurance shuttle walk test (m)	1		Mean Difference (Fixed, 95% CI)	265.0 [‐58.39, 588.39]
3 Dyspnoea (modified Borg score)	1		Mean Difference (Fixed, 95% CI)	‐0.4 [‐1.76, 0.96]
4 Oxygen saturation immediately post six‐minute walk test (6MWT)	1		Mean Difference (Fixed, 95% CI)	Totals not selected
5 Endurance time on cycle ergometer (s)	1		Mean Difference (Fixed, 95% CI)	118.7 [24.72, 212.68]
6 Minimum saturations at 6MWT (%)	1		Mean Difference (Fixed, 95% CI)	5.1 [3.50, 6.70]