Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Symptom severity
[78] Systematic review	28 people with mild to moderate hypoxaemia Data from 1 RCT	Dyspnoea score (assessed using Borg scale) 12 months +4.5 with domiciliary daily oxygen supplementation +5.7 with no oxygen supplementation	WMD –1.20 95% CI –2.47 to +0.07		Not significant