Table 1

Characteristics of participants

Healthy never smokersHealthy ever smokersCOPD never smokersCOPD ever smokers
(A) Grouped by disease status and smoking history
Subjects (n)37713094
Women (%)
Age (years)55.9±8.555.7±9.368.1±10.360.4±7.3
FEV1/FVC (%)81.7±5.177.5±6.256.5±15.256.3±11.6
Current smokers (%)46.546.8
Pack-years smoking029.6±39.6036.9 ± 18.7
Healthy normal BMIHealthy low BMICOPD normal BMICOPD low BMI
(B) Grouped by disease status and body mass index (BMI).
Subjects (n)5566816
BMI (kg/m2)26.3±3.320.9±0.626.8±3.421.1±1.3
Women (%)40.066.733.850.0
Age (years)56.4±7.253.3±4.160.0±6.959.9±7.8
FEV1/FVC ratio ×10080.6±6.079.5±6.455.5±12.254.4±8.4
Pack-years smoking14.7±14.916.8±10.536.3±20.534.6±18.0
  • Values are expressed as percentage or mean±SD.

  • BMI, body mass index; COPD, chronic obstructive pulmonary disease; FEV1%, forced expiratory volume in 1 s (% predicted); FVC, forced vital capacity.