Table 1: Obstructive sleep apnea syndrome (OSAS) definition according to American Academy of Sleep Medicine Task Force.

OSAS was diagnosedto have fulfilled criteria A or B and criterion C, as defined below:

A) Excessive daytime sleepiness that is not better explained by other factors;

B) Two or more of the following symptoms that cannot be better explained by other factors: choking or gasping during sleep, recurrent awakenings from sleep, non-refreshing sleep, daytime fatigue, or impaired concentration;

C) Overnight monitoring demonstrating five or more obstructed breathing events per hour during sleep. If the patient did not undergo a polysomnograph, s/he was diagnosed clinically as having OSAS using criteria A and B.