Table 2

Patient characteristics

Patient	Age yrs	Diagnostic group	BMI kg·m⁻²	Spirometry
				FEV₁ L BTPS	FVC L BTPS
1	54	CAL	20	0.6	2.3
2	68	OHS	42.7	1.35	2.09
3	73	Nm	24	1.85	2.61
4	65	OHS	39.6	1.79	2.38
5	62	Nm	29	1.4	1.56
6	64	OHS/CAL	35.7	0.57	0.99
7	53	CAH	32.1	3.3	4.45
8	70	OHS	52.2	1.67	2.02
9	57	CW	22.6	0.47	0.52
10	39	CW	20.3	0.71	0.73
11	43	CW/OSA	28.9	1.4	2.23
12	51	OHS	53.2	1.45	2.05
13	55	CW	18.5	0.85	1.3
14	69	OHS	48.7	1.45	2.04
15	80	Nm	18.9	0.5	0.81
16	73	CW	25	0.4	0.49
Mean±sd	61±11		32±12	1.2±0.7	1.8±1.0

BMI: body mass index
FEV₁: forced expiratory volume in one second
FVC: forced vital capacity
L BTPS: litres body temperature and pressure saturated
CAL: chronic airflow limitation
OHS: obesity-hypoventilation syndrome
Nm: neuromuscular disease
OSA: obstructive sleep apnoea
CAH: central alveolar hypoventilation
CW: chest wall deformity