Mechanical ventilation days were comparable between groups (22 ± 17 vs. 19 ± 15 days for groups I and II, respectively, p = 0.53) as were 28-day ventilator-free days (5 ± 7.6 and 4.6 ± 9, p = 0.88). Four patients in the H1N1 group and seven in the noninfluenza group underwent a tracheostomy procedure. Hospital and ICU LOS were comparable (median ± IQR: 16 ± 22 vs. 24.5 ± 26.5 and 12 ± 15 vs. 17 ± 25.5 days for the influenza group and II, respectively, Wilcoxon p = 0.17 and 0.45). Mortality was significantly higher for patients in the noninfluenza group (77 vs. 39%, p = 0.016). Interestingly, a Kaplan-Meier curve of ICU mortality (Figure 1) indicates that patients in the H1N1 group were more likely to be discharged alive from the ICU when the length of stay was greater than 25 days, despite a trend toward higher mortality within the first 2 weeks.