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Table 1 Characteristics of the study population (n = 119)

From: Development, validity and responsiveness of the Clinical COPD Questionnaire

     COPD  
  Healthy (ex)smokers At Risk (Stage 0) Mild (Stage I) Moderate (Stage IIA) Moderate (Stage IIB) Severe (Stage III)
N 44 18 15 20 16 6
Males (%) 48 33 60 70 81 100
Age, yr 51 (45–71) 53 (42–61) 54 (48–66) 57 (46–73) 66 (49–74) 59 (53–69)
Pack yr 24 (4–66) 29 (2–67) 31 (20–77) 35 (15–77) 36 (10–85) 34 (12–45)
Current smoking(%) 89 100 100 85 75 83
FEV1 (%pred) 101 (62–128) 105 (82–132) 93 (81–116) 69 (51–75) 41 (30–49) 24 (22–28)
  1. Healthy (ex) smokers; normal spirometry, no chronic symptoms (cough, sputum production). COPD classification of COPD by severity according to the GOLD guidelines; Stage 0: normal spirometry, chronic symptoms (cough, sputum production); Stage I: FEV1/FVC < 70%, FEV1 ≥ 80 % predicted, with or without chronic symptoms (cough, sputum production, dyspnea); Stage IIA: FEV1/FVC < 70%, 50% ≥ FEV1 < 80 % predicted; Stage IIB: FEV1/FVC < 70%, 30% ≥ FEV1 < 50 % predicted; Stage III: FEV1/FVC < 70%, FEV1 < 30 % predicted or FEV1 < 50% predicted plus respiratory failure or clinical signs of right heart failure.
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