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Table 4 Results of stepwise multiple regression models for utility (EQ-5D-5L) and total score (SGRQ-C)

From: Health-related quality of life of patients diagnosed with COPD in Extremadura, Spain: results from an observational study

Dependent variableExplanatory variablesaB coefficientbp-value95% CICoefficient of determination
Total score (SGRQ-C)Intercept35.604< 0.001(29.278; −41.930)0.431
Level of severity21.267< 0.001(12.119; 30.416)
Number of exacerbations in the past 12 months8.445< 0.001(5.140; 11.749)
Education level−18.147< 0.001(−27.469; −8.824)
Gender19.693< 0.001(8.864; 30.523)
Utility (EQ-5D-5L)Intercept0.763< 0.001(0.684; −0.842)0.296
Number of exacerbations in the last 12 months−0.086< 0.001(− 0.127; − 0.044)
Level of severity−0.1760.003(−0.291; − 0.061)
Education level0.1880.002(0.071; 0.305)
Gender−0.1570.024(−0.293; − 0.021)
  1. CI confidence interval, EQ-5D-5L EuroQol - 5 dimensions - 5 levels, SGRQ-C St. George Respiratory Questionnaire – COPD
  2. aExplanatory variables included in the models: gender (0: male (reference category)/1: female), age in years, education level (0: no education and primary education (reference category)/1: secondary and university education), level of severity (0: GOLD I-II (reference category)/1: GOLD III-IV), number of exacerbations in the last 12 months and number of comorbidities
  3. bUnstandardized B coefficient