Table 4—

Adjusted associations between St George's Respiratory Questionnaire total score (dependent variable) and respiratory disease-related variables in the general population weighted sample

BBetap‐value
COPD1.220.030.40
Asthma13.910.18**
% FEV1 over pred−0.13−0.21**
Interaction of COPD and % FEV1 over pred−0.19−0.11**
Smoking behaviour
 Never smoker
 Former smoker−0.080.000.91
 Smoker≤20 pack-yrs2.600.09**
 Smoker>20 pack-yrs2.360.080.02
Sex1.70.10**
Age#0.10.11**
Education1.40.080.02
Interaction of age and asthma1.20.13**
Constant5.0**
  • B: non standardized coefficient

  • Beta: standardized coefficient

  • COPD: chronic obstructive pulmonary disease

  • % FEV1 over pred: % force expiratory volume in one second over predicted n=862

  • #: age-centred

  • Coefficient of determination: (R2)=0.19 (adjusted R2=0.18)

  • **: p<0.01