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Table 1 Prevalence of bronchial obstruction according to different classification systems, by age

From: Does mild COPD affect prognosis in the elderly?

 

Age 65 - 74 years

N (%)

Age ≥ 75 years

N (%)

ATS/ERS

  

   No obstruction

451 (61.8)

245 (57.1)

   Mild obstruction

137 (18.8)

93 (21.7)

   Moderate/severe obstruction

142 (19.4)

91 (21.1)

BTS

  

   No obstruction

527 (72.2)

302 (70.4)

   Mild obstruction

135 (18.5)

96 (22.4)

   Moderate/severe obstruction

68 (9.3)

31 (7.2)

GOLD

  

   No obstruction

448 (61.4)

206 (48.0)

   Mild obstruction

79 (10.8)

96 (22.4)

   Moderate/severe obstruction

203 (27.8)

127 (29.6)