Table 3 Study 1: two-component structure from EFA using principal axis factoring with oblimin rotation; the structure matrix

From: Patient-reported outcomes in primary care patients with COPD: psychometric properties and usefulness of the Clinical COPD Questionnaire (CCQ). A cross-sectional study

 

Impact

Coughing

Eigen values

5.3

1.4

Percentage of variance

53.0

14.0

Factor loadings

CCQ 1. Short of breath

0.69

0.41

CCQ 2. Short of breath doing physical activities

0.70

0.47

CCQ 3. Concerned about getting a cold or your breathing getting worse

0.70

 

CCQ 4. Depressed (down) because of your breathing problems

0.75

 

CCQ 5. Did you cough?

 

0.84

CCQ 6. Did you produce phlegm?

0.42

0.84

CCQ 7. Limited in strenuous activities

0.75

0.49

CCQ 8. Limited in moderate physical activities

0.84

0.42

CCQ 9. Limited in daily activities at home

0.75

 

CCQ 10. Limited in social activities

0.76

 
  1. All factor loadings >0.40 are displayed.
  2. Abbreviations: CCQ, Clinical COPD Questionnaire; EFA, exploratory factor analysis.
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