Figure 2. Main Outcome Assessed by Modified Rankin Scale Score at 90-Day Follow-up.

From the ordinal regression analysis, the unadjusted odds ratio for a better outcome (lower modified Rankin Scale [mRS] score) was 0.97 (95% CI, 0.89 to 1.05; P = .47) for combined oxygen vs control, and 1.03 (95% CI, 0.93 to 1.13; P = .61) for continuous oxygen vs nightly oxygen (mRS score range, 0 to 6 [0, no symptoms; 1, few symptoms but able to carry out all previous activities and duties; 2, unable to carry out all previous activities but able to look after own affairs without assistance; 3, needs some help with looking after own affairs but able to walk without assistance; 4, unable to walk without assistance and unable to attend to own bodily needs without assistance but does not need constant care and attention; 5, major symptoms such as bedridden and incontinent and needs constant attention day and night; 6, death]).