Table 1—

Demographic characteristics of the study population

Patients n137
Median age yrs43
Sex
 Males92 (67)
 Females45 (33)
Smoking history
 Never-smoker89 (65)
 Current smoker21 (15)
 Ex-smoker27 (20)
Pulmonary function# % pred
 TLC94 (91–96)
 VC94 (91–97)
 FEV1/VC %78 (76–80)
 FEV190 (87–93)
DL,CO81 (78–84)
Radiographic stage
 07 (5)
 I75 (55)
 II32 (23)
 III22 (16)
 IV1 (1)
CT characteristics n
 Enlarged LN130
 ILD71
  • Data are presented as n (%) or mean (95% confidence interval) unless otherwise indicated. % pred: % predicted; TLC: total lung capacity; VC: vital capacity; FEV1: forced expiratory volume in 1 s; DL,CO: diffusing capacity of the lung for carbon monoxide; CT: computed tomography; LN: lymph node; ILD: interstitial lung disease. #: using body plethysmography.