Figure 2. Time to First Chronic Obstructive Pulmonary Disease–Related Acute Care Event (Hospitalization or Emergency Department Visit) or Death.

The median time to first event for the intervention group is 122 days (95% CI, 78-180) compared with greater than 180 days for the usual care group (exact value is not computed because it is beyond the 6-month observation period). Cox proportional hazards model adjusted for hospital unit, age, oxygen use, and prior hospitalization.