The aim of this study was to examine the role of oxygen saturation (SaO(2)) measurement in identifying apnoeic snorers from non-apnoeic snorers and in the assessment of the severity of obstructive sleep apnoea. Ninety-two patients with clinically suspected obstructive sleep apnoea syndrome (OSAS) were assessed using overnight polysomnography. The patients were classified as follows: 14 patients were non-apnoeic snorers 27 patients had mild OSAS 31 patients had moderate OSAS and 20 patients had ...