The Apnea-Hypopnea Index (AHI) is calculated as the total number of apneas and hypopneas divided by:

The Apnea-Hypopnea Index (AHI) is calculated

Multiple choice — select the best answer

ATotal recording time
BTotal sleep time in hours
CREM sleep time
DNREM sleep time

✓ Correct answer: B. Total sleep time in hours AHI = (total apneas + hypopneas) / total sleep time (hours). Using total recording time would underestimate severity because awake time is excluded.

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The Apnea-Hypopnea Index (AHI) is calculated as the total number of apneas and hypopneas divided by:

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