Table 1.

Demographic characteristics of the study group

	Average±standard deviation (N = 180)
Age	22.3±5.0 years
Height	158.4±8.7 cm
Weight	40.6±15.1 kg
Body mass index	16.3±5.6
Left ventricular ejection fraction (%)†	46.0±15.4
Forced vital capacity (%)††	619.8±478.4 mL (15.2±12.7%)
Duration of noninvasive ventilation	11.0±4.2 hours/day
Maximal insufflation capacity	1328±532 mL
Unassisted peak cough flow	107±84 L/min
Assisted peak cough flow	258±91 L/min
Maximal inspiratory pressure (% †)	19.4±13.0 cmH2O (19.0±14.6%)
Maximal expiratory pressure (% †)	17.8±10.0 cmH2O (12.0±7.3%)

^†Available at 176 patients. ^††Ratio for predictive normal value.