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Table 4 Correlations between questionnaire responses, quality of life and respiratory function in patients with COPD (N = 93)

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

  CCQ Total CCQ Symptoms CCQ Function CCQ Mental FEV1 FEV1/FVC SF
CCQ Total 1 0.915** 0.953** 0.842** -0.252* -0.135 -0.384**
CCQ Symptoms 0.915** 1 0.779** 0.685** -0.230* -0.100 -0.292**
CCQ Function 0.953** 0.779** 1 0.754** -0.260 -0.145 -0.435**
CCQ Mental 0.842** 0.685** 0.754** 1 -0.164 -0.116 -0.267**
FEV1 -0.252* -0.230* -0.260* -0.164 1 0.358** 0.538**
FEV1/FVC -0.135 -0.100 -0.145 -0.116 0.358** 1 0.345**
SF -0.384** -0.292** -0.435** -0.267** 0.538** 0.345** 1
  1. * indicates a statistically significant association of p < 0.05
  2. ** indicates a statistically significant association of p < 0.001