Table E1.

Breakdown of out-of-hospital CPAP costs.

	Number of Devices			Source	Unit Cost, £ ($)		Source	Total Cost, £ ($)
Device costs
Out-of-hospital CPAP device	Number of ambulances that need the CPAP device (420)			Expert advisory input	513.49 (744.50)		Vygon: hospital CPAP kit	513.49×420
	Assuming 10% new CPAP devices during 5-y usage (42)			Expert advisory input	513.49 (744.50)		Vygon: hospital CPAP kit	513.49×42
Total cost of the device								237,232
Setup/implementation costs
	Resource Usage
Initial training	1,500 paramedics for 2 days each			Expert advisory input	150 (217.50) per day		Expert advisory input	450,000 (652,500)
Service reconfiguration	1-off cost for reconfiguration						Expert advisory input	100,000 (145,000)
Total setup/implementation costs								550,000 (797,500)
Maintenance costs
		Resource Usage
Consumables		Number of patients during 5 y=5×N	Expert advisory input		189.93 (275) per use	Vygon: facial mask, oxygen tubing, and valve		189.93×5×N (275×5×N)
Ongoing training		1,500 paramedics for 1 day each	Expert advisory input		150 (217.50) per day	Expert advisory input		225,000 (326,500)
Total maintenance costs								225,000+949.65×N (326,500+1,375×N)
Total costs of out-of-hospital CPAP								1,012,232+949.65×N
Total number of patients (N patients per year times depreciation period of 5 y (ie, assuming new out-of-hospital CPAP equipment will be required in 5 y)								5×N
Cost of out-of-hospital CPAP per patient								189.93+202,446/N (275.50+293,546/N)