Table 1

 Mean (SE) patient demographic data, anthropometric measures and established ventilator settings

BMI, body mass index; FEV1, forced expiratory volume in 1 second; FVC, forced vital capacity; IPAP, set inspiratory positive airways pressure; Pao2, Paco2, arterial oxygen and carbon dioxide tensions; HCO3, bicarbonate; Sao2, oxygen saturation.
*Unassisted ventilation taken at 08.00 hours.
No (male)13 (6)
Age (years)60.5 (12.7)
Height (m)1.56 (0.09)
Diagnosis (n)
    Post polio4
    Early onset kyphoscoliosis7
    Pott’s disease1
BMI (kg/m)25.3 (5.3)
FEV1 (l)0.60 (0.04)
FVC (l)0.69 (0.05)
IPAP (cm H2O)23.0 (1.3)
pH*7.38 (0.01)
HCO3 (mmol/l)*28.6 (0.68)
Pao2 (kPa)*8.83 (0.26)
Paco2 (kPa)*6.42 (0.09)
Sao2 (%)*91.7 (0.7)