Table 1

Demographic and lung function characteristics of study subjects

NMean (SD)
FEV1=forced expiratory volume in 1 second; FVC=forced vital capacity; Tlco=carbon monoxide transfer factor.
*Normal range 10.84 (2.52) mmol/min/kPa.
Patients with complete data660
Pre-salbutamol FEV1 (l)6601.28 (0.46)
Pre-salbutamol FEV1 (% predicted)66045.5 (14.9)
Pre-salbutamol FVC (l)6602.94 (0.76)
Pre-salbutamol FEV1/FVC6600.43 (0.11)
Tlco (mmol/min/kPa)*5564.91 (2.10)
Age (years)66063.8 (7.0)
Pack years smoked61544.6 (32.4)
Current smokers/ex-smokers314/34548%/52%
Previous use of regular inhaled steroids (yes/no)353/30753%/47%