Fig. 4
From: Role of sleep on respiratory failure after extubation in the ICU
Kaplan–Meier curves showing time from polysomnography to reintubation according to the presence of atypical sleep or normal sleep (at left) and the presence or not of rapid eye movement (REM) sleep. The rates of reintubation within the first 7 days after polysomnography was 14% (6/42) in patients with normal sleep vs. 10% (1/10) in those with atypical sleep (p = 0.75 using log-rank test), and was 5% (1/19) in patients with REM sleep vs. 18% (6/33) in those with no REM sleep (p = 0.19 using log-rank test)