Assessment of OSA
All individuals with clinical suspicion underwent overnight
polysomnography (PSG). They were asked if they had a specific set of
symptoms indicating OSA: witnessed snoring; observed to have apneas;
non-restful sleep; daytime sleepiness. Diagnosis of OSA was defined by
standard criteria.9
The Epworth Sleepiness Scale (ESS) questionnaire, which is widely used
for assessing daytime sleepiness, was also finished by the patients on
the same visit. Demographic data including gender, age, BMI, AHI,
minimum oxygen saturation and oxygen saturation <90% were
also obtained.