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Table 3 Comparison of pseudo-R-squareda of different models (percentage of variance explained by different models)

From: Assessing health-related quality of life in COPD: comparing generic and disease-specific instruments with focus on comorbidities

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

  1. a R2 according to Cox & Snell [24]