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Table 5 Multiple-regression analyses of COOP/WONCA chart scores (dependent variables) and predictive variables

From: Application of the COOP/WONCA charts to aged patients with chronic obstructive pulmonary disease: a comparison between Japanese and Chinese populations

Dependent variables Predictive variables β P R2
     Adjusted R2
Physical fitness Population group 0.125 < 0.001  
  Age 0.152 < 0.001 0.245
  Sex 0.132 < 0.001 0.240
  COPD status 0.252 < 0.001  
  Number of respiratory symptoms 0.161 < 0.001  
  Heating sources    
Feelings Population group −0.280 < 0.001  
  Age    0.121
  Sex    0.119
  COPD status    
  Number of respiratory symptoms 0.318 < 0.001  
  Heating sources    
Daily activities Population group    
  Age 0.107 0.020 0.257
  Sex    0.254
  COPD status 0.396 < 0.001  
  Number of respiratory symptoms 0.184 < 0.001  
  Heating sources    
Social activities Population group    
  Age −0.114 0.002 0.204
  Sex    0.201
  COPD status 0.264 < 0.001  
  Number of respiratory symptoms 0.258 < 0.001  
  Heating sources    
Change of health Population group 0.156 < 0.001  
  Age    0.045
  Sex    0.042
  COPD status    
  Number of respiratory symptoms    
  Heating sources −0.204 < 0.001  
Overall health Population group 0.216 < 0.001  
  Age    0.199
  Sex    0.195
  COPD status 0.197 < 0.001  
  Number of respiratory symptoms 0.172 < 0.001  
  Heating sources    
Pain Population group −0.185 < 0.001  
  Age    0.117
  Sex 0.207 < 0.001 0.112
  COPD status 0.129 0.005  
  Number of respiratory symptoms 0.234 < 0.001  
  Heating sources    
  1. n = 737.
  2. Population group (Japanese: 0, Chinese: 1) Sex (male: 0, female: 1), Heating sources (Biomass, coal, Animal dung: 1, Gas, Electric, Steam: 0) Number of respiratory symptoms (0–4), COPD status (health: 0, GOLD LV 1–4: 1–4).