Figure 2. Kaplan-Meier analysis and curves for readmission demonstrating the difference in readmission rates between the 3 PAP usage groups.

Full users were defined as patients with use of PAP ≥ 4 h per night on 70% of nights during a consecutive 30-day period in the first 90 days of PAP treatment. Readmission was defined as hospitalization or visit to the emergency department from 48 h to 30 days after discharge. PAP, positive airway pressure.