The major predisposing factor for obstructive sleep apnea is excess body weight. But a study (#0565) being presented as a poster later this morning confirms a high prevalence of OSA in non-obese, adult patients who were referred to a sleep center for overnight polysomnography; the primary cause for referral was a complaint of excessive daytime sleepiness.
Each patient was 18 years of age or older; 57 percent were men. Patients were considered non-obese if they had a body mass index (BMI) of 18.5 to 27. Results show that OSA was diagnosed in 2,906 of the 5,426 non-obese patients (54 percent) who were evaluated by polysomnography at one of 18 sleep centers.
You can download the SLEEP 2009 abstract supplement as an 11 MB file in PDF format.