Related Variables

	ahi_a0h4	Apnea-Hypopnea Index (AHI) >= 4% - number of [all apneas] and [hypopneas with >= 4% oxygen desaturation] per hour of sleep	Measurements/Polysomnography (PSG)
	ahi_c0h4	Central Apnea-Hypopnea Index (AHI) >= 4% - number of [central apneas] and [hypopneas with >= 4% oxygen desaturation] per hour of sleep	Measurements/Polysomnography (PSG)
	ahi_o0h4	Obstructive Apnea-Hypopnea Index (OAHI) >= 4% - number of [obstructive apneas] and [hypopneas with >= 4% oxygen desaturation] per hour of sleep	Measurements/Polysomnography (PSG)