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Mean (SE) values of apnea-hypopnea index (AHI) during NREM and rapid eye movement (REM) sleep. Left: 62 pairwise matched apneic men and women by passive pharyngeal critical pressure (Pcrit). Right: 24 pairwise matched apneic men and women by body mass index, age, and passive Pcrit. NS, not significant. *P < 0.005.
