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Table 2 Estimated regression coefficients from the additive model

From: Multimorbidity and health-related quality of life in the older population: results from the German KORA-Age study

   Main effect model (adj. R2 = 0.171) Model with interaction terms (adj. R2 = 0.177)
Covariate Estimate 95% confidence limits p-value Estimate 95% confidence limits p-value
Intercept 81.85 80.74 82.96 < 0.0001 81.56 80.44 82.67 < 0.0001
Data collection* Telephone interview -4.49 -5.89 -3.08 <0.0001 -4.55 -5.95 -3.15 <0.0001
Age (years) see Figure 1 <0.0001 not shown <0.0001
BMI (kg/m2) see Figure 1 <0.0001 not shown <0.0001
Sex Female -4.06 -5.13 -2.99 <0.0001 -3.96 -5.03 -2.89 <0.0001
Education Secondary 0.07 -1.29 1.44 0.9151 0.06 -1.30 1.42 0.9332
  Tertiary 3.71 2.08 5.34 <0.0001 3.72 2.10 5.35 <0.0001
Diabetes mellitus -2.49 -3.89 -1.10 0.0004 -1.27 -2.77 0.22 0.0946
Coronary event -3.94 -5.67 -2.21 <0.0001 -0.64 -2.73 1.45 0.5462
Stroke -11.25 -13.23 -9.26 <0.0001 -9.44 -11.66 -7.22 <0.0001
Cancer -2.67 -4.16 -1.17 0.0005 -2.79 -4.28 -1.30 0.0002
Chronic bronchitis -8.10 -10.18 -6.03 <0.0001 -8.14 -10.21 -6.07 <0.0001
Hypertension -1.15 -2.22 -0.07 0.0367 -1.23 -2.30 -0.16 0.0248
Diabetes*coronary event      -8.12 -11.95 -4.28 <0.0001
Coronary event*stroke      -8.28 -13.17 -3.38 0.0009
  1. The dependent variable is the EQ-5D index score.
  2. BMI: Body mass index
  3. *Reference category: Questionnaire respondents
  4. †Reference category: Male sex
  5. ‡Reference category: Primary Education
  6. All events are self-reported