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Table 3 Test re-test reliability of the CCQ taken with a 5 days difference among patients with COPD as indicated through the Inter Correlation Coefficient (ICC) (n = 16)

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

   95% C.I
  ICC Lower Limit Upper Limit
CCQ total score before - CCQ total score after 0.990 0.971 0.996
On average, during the past 24 hours, how often did you feel:
Short breath at rest? 0.977 0.935 0.992
Short of breath doing physical activities? 0.979 0.941 0.993
Concerned about getting a cold or your breathing getting worse? 0.920 0.788 0.971
Depressed (down) because of your breathing problems? 0.967 0.908 0.988
In general, during the past 24 hours, how much of the time:
Did you cough? 0.990 0.972 0.997
Did you produce phlegm? 0.939 0.836 0.978
On average, during the past 24 hours, how limited were you in these activities because of your breathing problems:
Strenuous physical activities 0.976 0.933 0.992
Moderate physical activities 0.983 0.952 0.994
Daily activities at home 0.948 0.859 0.982
Social activities 0.976 0.932 0.991