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Published on: 7/14/2026

What does the number of sleep apnea events per hour indicate about severity?

Yoshinori Abe

Reviewed by Yoshinori Abe, MD

Internal Medicine

Sleep apnea severity is measured by the Apnea-Hypopnea Index (AHI), which counts the number of breathing interruptions per hour of sleep. Mild sleep apnea involves 5–14 events per hour, moderate ranges from 15–29 events, and severe sleep apnea is 30 or more events per hour. A higher AHI means more disrupted breathing, greater oxygen deprivation, and increased risk of health complications like heart disease, stroke, and daytime fatigue.

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Reviewed for medical accuracy: 07/14/2026

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Important Next Steps

Learn if sleep apnea events are severeDiscover possible causes of your sleep apneaFind out if symptoms suggest sleep apneaSee over-the-counter options for sleep apnea symptomsFind sleep doctors near youUnderstand home remedies for sleep apneaCheck if sleep apnea needs urgent care

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Explanation

The severity of sleep apnea is often measured by the number of apnea or hypopnea events per hour of sleep, known as the Apnea-Hypopnea Index (AHI).

Levels of Severity:

  • Mild: 5 to 15 events per hour
  • Moderate: 15 to 30 events per hour
  • Severe: 30 or more events per hour

These numbers help doctors understand how serious the sleep apnea is and guide treatment decisions. However, it's important to note that the AHI is just one way to measure severity. Other factors, like how tired a person feels during the day and any other health problems they might have, are also important. If you're experiencing symptoms like excessive daytime fatigue or disrupted sleep, consider using a symptom checker to better understand your condition. Some researchers suggest looking at additional parameters to get a complete picture of the condition, as different people might be affected differently by similar AHI scores.

(References)

  • De Backer W. (2013). Obstructive sleep apnea/hypopnea syndrome. Panminerva medica, 23676959.

  • Malhotra A, Ayappa I, Ayas N, Collop N, Kirsch D, Mcardle N, et al. (2021). Metrics of sleep apnea severity: beyond the .... Sleep, 33693939.

  • Kulkas A, Tiihonen P, Eskola K, Julkunen P, Mervaala E, & Töyräs J. (2013). Novel parameters for evaluating severity of sleep .... Journal of medical engineering & technology, 23360196.

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