Understanding the Results | Sleep Medicine - Harvard University
https://sleep.hms.harvard.edu/education-training/public-education/sleep-and-health-education-program/sleep-health-education-34
WebApr 16, 2021 · Based on the AHI, the severity of OSA is classified as follows: None/Minimal: AHI < 5 per hour. Mild: AHI ≥ 5, but < 15 per hour. Moderate: AHI ≥ 15, but < 30 per hour. Severe: AHI ≥ 30 per hour. When a home sleep study is done, the AHI is often expressed as the Respiratory Event Index (REI). The REI is the number of apneas or hypopneas ...
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