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Many patients with obstructive sleep apnea (OSA) participate in the work force. However, the impact of OSA and sleepiness on work performance is unclear.

To address this issue, we administered the Epworth Sleepiness Scale (ESS), the Work Limitations Questionnaire (WLQ), and an occupational survey to patients undergoing full-night polysomnography for the investigation of sleep-disordered breathing. Of 498 patients enrolled in the study, 428 (86.0%) completed the questionnaires. Their mean age±standard deviation (SD) was 49±12years, mean body mass index (BMI) was 31±7kg/m² mean apnea hypopnea index (AHI) was 21±22 events/h, and mean ESS score was 10±5. Subjects worked a mean of 39±18h per week. The first 100 patients to complete the survey were followed up at two years.

In the group as a whole, there was no significant relationship between …