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Table 1 Demographic and clinical characteristics of the study sample (N = 240 COPD patients)

From: A psychometric assessment of the St. George’s respiratory questionnaire in patients with COPD using rasch model analysis

Variables Mean/n SD/%
Sex: male 240  
Age: mean years (SD) 70.4 7.9
Lung function: mean (SD)   
 FEV1 (% predicted)a 56.0 21.7
 FEV1/FVCb ratio (%) 56.3 12.5
Education: counts (%)   
 Elementary school and below 158 66.11
 Junior and senior high school 65 27.20
 Junior college and above 16 6.69
Marital status: counts (%)   
 Married & lives together 207 86.97
 Other (unmarried, divorce, widower or widow) 31 13.03
Current smoking status: yes counts (%) 66 28.21
Disease severity: counts (%)   
 Stage 0 & I: at risk or mild 39 16.25
 Stage II: moderate 86 35.83
 Stage III: severe 95 39.58
 Stage IV: very severe 20 8.33
  1. aFEV1 (% predicted) = forced expiratory volume in 1 s (% predicted)
  2. bFVC = forced vital capacity