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Table 2 Agreement between SGRQ and the CCQ based on the new GOLD classification of the CCQ cutoff value

From: The cutoff point of clinical chronic obstructive pulmonary disease questionnaire for more symptomatic patients

  CCQ < 1 CCQ ≥1
SGRQ < 25 11 27
SGRQ ≥25 2 83
Agreement: 76.42%; kappa value, 0.33
  CCQ < 1.4 CCQ ≥1.4
SGRQ < 25 23 15
SGRQ ≥25 7 78
Agreement: 82.11%; kappa value, 0.56
  CCQ < 0.7 CCQ ≥0.7
SGRQ < 25 8 30
SGRQ ≥25 0 85
Agreement: 75.61%; kappa value, 0.27
  1. Abbreviations: CCQ Clinical Chronic Obstructive Pulmonary Disease Questionnaire, GOLD Global Initiative for Chronic Obstructive Lung Disease, SGRQ St. George’s Respiratory Disease Questionnaire