Table 5

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

n = 737.

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).

Yamaguchi et al.

Yamaguchi et al. BMC Public Health 2013 13:754   doi:10.1186/1471-2458-13-754

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