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Pharyngeal critical closing pressure (Pcrit; top) and loop gain (bottom) in 11 men and 11 women matched for severity of obstructive sleep apnea (within 5 events/h). Individual and group means (±SE) are presented. Subjects identified by horizontal bars and shaded symbols are individuals who did not develop periodic breathing, and thus their loop gain may be lower than the value indicated. There were no significant differences between genders in either variable.
