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Table 1 Descriptive statistics of the study population

From: Smoking cessation can improve quality of life among COPD patients: Validation of the clinical COPD questionnaire into Greek

   COPD group
  Control group (n = 55) All stages of COPD (n = 93) Stage I: Mild COPD (n = 22) Stage II: Moderate COPD (n = 65) Stage III: Severe COPD (n = 6)
  % (n) % (n) % (n) % (n) % (n)
Gender(male) 63.6% (35) 72% (67) 81.8% (18) 69.2% (45) 66.7% (4)
  Mean ± SD Mean ± SD Mean ± SD Mean ± SD Mean ± SD
Age (mean) 60.45 ± 11.46 66.35 ± 9.68 55.14 ± 7.03 68.80 ± 6.57 81 ± 8.65
CCQ Total Score 0.05 ± 0.11 1.437 ± 1.19 1.09 ± 1.17 1.58 ± 1.19 1.17 ± 1.20
CCQ Symptoms 0.05 ± 0.19 1.357 ± 1.16 1.15 ± 1.07 1.44 ± 1.20 1.25 ± 1.20
CCQ Functional state 0.05 ± 0.10 1.720 ± 1.49 1.25 ± 1.47 1.92 ± 1.48 1.25 ± 1.46
CCQ Mental state 0.05 ± 0.16 1.032 ± 1.18 0.66 ± 1.24 1.18 ± 1.17 0.83 ± 0.88
FEV 1 97.65 ± 8.70 70.06 ± 11.1 82.66 ± 2.95 67.94 ± 7.99 46.83 ± 3.93
FEV1/FVC 89.42 ± 7.85 62.90 ± 7.7 69.43 ± 2.17 60.75 ± 7.75 62.27 ± 7.63
SF-12 3.10 ± 0.33 2.909 ± 0.36 3.14 ± 0.33 2.87 ± 0.33 2.49 ± 0.26