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Jonas DE, Amick HR, Feltner C, et al. Screening for Obstructive Sleep Apnea in Adults: An Evidence Review for the U.S. Preventive Services Task Force [Internet]. Rockville (MD): Agency for Healthcare Research and Quality (US); 2017 Jan. (Evidence Syntheses, No. 146.)
This publication is provided for historical reference only and the information may be out of date.
Screening for Obstructive Sleep Apnea in Adults: An Evidence Review for the U.S. Preventive Services Task Force [Internet].
Show detailsTable 1Definitions
| Term | Definition |
|---|---|
| Apnea | Cessation of airflow for at least 10 seconds8,275 |
| Hypopnea | Reduction in airflow by at least 30% for at least 10 seconds with decrease in oxygen saturation |
| Apnea-hypopnea index (AHI)* | Number of apnea and hypopnea events per hour of sleep |
| Obstructive sleep apnea (OSA) | |
| Mild8,73 | AHI ≥5 to <15 |
| Moderate8,73 | AHI ≥15 to <30 |
| Severe8,73 | AHI ≥30 |
| Obstructive sleep apnea syndrome | AHI ≥5 with evidence of daytime sleepiness3,8,276 |
- *
The respiratory disturbance index (RDI) is a similar measure to AHI, but it also includes the number of respiratory effort–related arousals per hour of sleep (in addition to apnea and hypopnea events).
Abbreviations: AHI=apnea-hypopnea index; OSA=obstructive sleep apnea; RDI=respiratory disturbance index.
- Table 1, Definitions - Screening for Obstructive Sleep Apnea in AdultsTable 1, Definitions - Screening for Obstructive Sleep Apnea in Adults
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