Related Variables

	cpapuse	Used CPAP during the sleep study or use CPAP regularly	Lab Visit
	nouse	Reason why participant is not using prescribed CPAP	Lab Visit
	prescpap	Ever prescribed CPAP	Lab Visit
	regbas	If you were prescribed CPAP, are you still using it on a regular basis?	Lab Visit
	regcpap	Current regular use of CPAP (at least 50% of the time)	Lab Visit
	prelcpap	Sleep Study: on CPAP	Lab Visit/Physiology
	a930cpap	9:30 AM - how long since last use of CPAP	Nurse's Notes
	am7cpap	7 AM - how long since last use of CPAP	Nurse's Notes
	pm10cpap	10 PM - how long since last use of CPAP	Nurse's Notes
	cpap130	Was the participant on CPAP?	Polysomnography/Respiratory Events/Apnea