Table 2.

Median daily averages of each ventilator index measurements by diagnostic group

Measure	Diagnostic group	Median	IQR
Usage (hours)	Obesity hypoventilation syndrome	7.6	4.9
	Neuromuscular disease	9.2	4
	Restrictive chest wall disease	8.9	1.3
	Obstructive lung disease	9.2	5.6
Total leak (L/min)	Obesity hypoventilation syndrome	51	39
	Neuromuscular disease	55	35
	Restrictive chest wall disease	41	13
	Obstructive lung disease	38	18
Unintentional leak (L/min)	Obesity hypoventilation syndrome	11	22
	Neuromuscular disease	9	25
	Restrictive chest wall disease	12	4
	Obstructive lung disease	12	8
Tidal volume (mL)	Obesity hypoventilation syndrome	446	199
	Neuromuscular disease	338	340
	Restrictive chest wall disease	319	272
	Obstructive lung disease	619	360
Minute ventilation (L/min)	Obesity hypoventilation syndrome	9.0	3.3
	Neuromuscular disease	6.0	4.6
	Restrictive chest wall disease	5.5	5.2
	Obstructive lung disease	11.3	6.5
Respiratory rate (bpm)	Obesity hypoventilation syndrome	18	8
	Neuromuscular disease	17	11
	Restrictive chest wall disease	19	8
	Obstructive lung disease	17	1
Participant triggered breaths (%)	Obesity hypoventilation syndrome	86	66
	Neuromuscular disease	55	91
	Restrictive chest wall disease	58	93
	Obstructive lung disease	13	77
Apnoea–Hypopnoea Index (events per hour)	Obesity hypoventilation syndrome	1.7	21.7
	Neuromuscular disease	2.7	5.7
	Restrictive chest wall disease	1.4	1.9
	Obstructive lung disease	0.9	6.7