Table 1

Clinical characteristics in control and chronic obstructive pulmonary disease (COPD) group

Control groupCOPD groupp‐value
Subjects n41198
Male %7685ns
Age yrs67±568±9ns
BMI kg·m−228.24±4.6924.86±5.740.001
FEV1 L2.54±0.631.04±0.390.001
Change in FEV1 mL·yr−1−37±228−106±1730.003
First 6MWD m532±82238±1070.001
Change in 6MWD m·yr−112±25−26±370.001
Follow-up period yrs2.0±0.71.9±1.2ns
  • BMI: body mass index

  • FEV1: forced expiratory volume in one second

  • 6MWD: 6‐min walk distance

  • ns: nonsignificant