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Hazard for all-cause mortality for FEV1 (L) by category of apnea–hypopnea index (AHI). (Top left) AHI <5.0 events per hour. (Top right) AHI 5.0–14.9 events per hour. (Bottom left) AHI 15.0–29.9 events per hour. (Bottom right) AHI ≥30.0 events per hour.
