Table 1. Severity levels of obstructive sleep apnea according to the apnea-hypopnea index as per ICSD (e1).

Finding	AHI index
Primary snoring	AHI <5
Mild OSA	5 ≤ AHI <20
Moderate OSA	20 ≤ AHI <40
Severe OSA	40 <ahi

AHI, apnea-hypopnea index; ICSD, International Classification of Sleep Disorders