Table 3.

Comparison of pseudo-R-squared^a of different models (percentage of variance explained by different models)

Models considering…	EQ-5D utility	EQ-5D VAS	CAT score	SGRQ total score
Age, sex, education, smoking status, BMI category	0.034	0.029	0.041	0.043
Age, sex, education, smoking status, BMI category and COPD grade	0.063	0.125	0.112	0.201
Age, sex, education, smoking status, BMI category and low/high number of comorbidities	0.074	0.048	0.074	0.075
Age, sex, education, smoking status, BMI category, COPD grade and low/high number of comorbidities	0.106	0.145	0.149	0.238

^a R² according to Cox & Snell [24]