Figure 4.

Kaplan-Meier plots of the probability of ICU delivery over time for each ventilation group. The median length of ICU stay was 11 days in the high-frequency oscillatory ventilation group, inter-quartile range 7.2 to 15.7 compared with 14 days in the conventional mechanical ventilation group, inter-quartile range 9 to 22, logrank test, 9.39, P = 0.002. CMV, conventional mechanical ventilation; HFOV, high-frequency oscillatory ventilation.