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Table 3 Coefficient estimates and goodness-of-fit measures of various regression models mapping the FACT-B subscales to EQ-5D-5L utility index based on baseline survey (N = 238)

From: Mapping the Functional Assessment of Cancer Therapy - Breast (FACT-B) to the 5-level EuroQoL group’s 5-dimension questionnaire (EQ-5D-5L) utility index in a Multi-ethnic Asian population

  Model 1 Model 2 Model 3 Model 4 Model 5
Ordinary least square      
Regression coefficients      
 Constant 0.2901** 0.3071** 0.3064** 0.2846** 0.3031**
 Physical well-being 0.0120** 0.0127** 0.0125** 0.0121** 0.0128**
 Social well-being −0.0003 −0.0003    
 Emotional well-being 0.0042* 0.0062**   0.0041 0.0061**
 Functional well-being 0.0046** 0.0048** 0.0052** 0.0044** 0.0046**
 Breast cancer subscale 0.0035*   0.0048** 0.0034*  
Goodness-of-fit measures      
 Square of correlation coefficient, r2 0.4975 0.4870 0.4890 0.4973 0.4870
 Adjusted r2 0.4867 0.4782 0.4824 0.4887 0.4804
 Mean square error 0.0132 0.0135 0.0135 0.0132 0.0135
 Mean absolute deviation 0.0913 0.0918 0.0925 0.0913 0.0919
Tobit model      
Regression coefficients      
 Constant 0.1983** 0.2200** 0.2342** 0.2077** 0.2318**
 Physical well-being 0.0144** 0.0153** 0.0147** 0.0142** 0.0152**
 Social well-being 0.0006 0.0007    
 Emotional well-being 0.0050 0.0077**   0.0051 0.0078**
 Functional well-being 0.0048* 0.0051** 0.0060** 0.0051** 0.0054**
 Breast cancer subscale 0.0045*   0.0063** 0.0046*  
Goodness-of-fit measures      
 Square of correlation coefficient, r2 0.4965 0.4861 0.4887 0.4971 0.4869
 Adjusted r2 0.4856 0.4773 0.4821 0.4885 0.4803
 Mean square error 0.0143 0.0146 0.0145 0.0143 0.0145
 Mean absolute deviation 0.0934 0.0937 0.0945 0.0934 0.0936
Censored least absolute deviation      
Regression coefficients      
 Constant 0.3062** 0.3208** 0.3200** 0.2948** 0.3149**
 Physical well-being 0.0119** 0.0121** 0.0123** 0.0122** 0.0121**
 Social well-being −0.0004 −0.0003    
 Emotional well-being 0.0041 0.0054**   0.0042 0.0054**
 Functional well-being 0.0037* 0.0054** 0.0039* 0.0037* 0.0053**
 Breast cancer subscale 0.0036   0.0054** 0.0035  
Goodness-of-fit measures      
 Square of correlation coefficient, r2 0.4968 0.4863 0.4873 0.4968 0.4862
 Adjusted r2 0.4860 0.4775 0.4807 0.4882 0.4796
 Mean square error 0.0133 0.0135 0.0135 0.0133 0.0135
 Mean absolute deviation 0.0912 0.0917 0.0923 0.0913 0.0917
  Model 1 Model 2 Model 3 Model 4 Model 5
Quantile regression      
Regression coefficients      
 Constant 0.3062** 0.3208** 0.3200** 0.2948** 0.3149**
 Physical well-being 0.0119** 0.0121** 0.0123** 0.0122** 0.0121**
 Social well-being −0.0004 −0.0003    
 Emotional well-being 0.0041 0.0054**   0.0042* 0.0054**
 Functional well-being 0.0037** 0.0054** 0.0039** 0.0037** 0.0053**
 Breast cancer subscale 0.0036   0.0054** 0.0035  
Goodness-of-fit measures      
 Square of correlation coefficient, r2 0.4968 0.4863 0.4873 0.4968 0.4862
 Adjusted r2 0.4860 0.4775 0.4807 0.4882 0.4796
 Mean square error 0.0133 0.0135 0.0135 0.0133 0.0135
 Mean absolute deviation 0.0912 0.0917 0.0923 0.0913 0.0917
Logistic quantile regression      
Regression coefficients      
 Constant −1.6525 −1.6097 −1.5750* −1.6489 −1.6678
 Physical well-being 0.0684 0.0710 0.0678* 0.0683** 0.0722**
 Social well-being 0.0001 −0.0035    
 Emotional well-being 0.0155 0.0320   0.0157 0.0308
 Functional well-being 0.0230 0.0312 0.0247 0.0230 0.0295
 Breast cancer subscale 0.0216   0.0301 0.0214  
Goodness-of-fit measures      
 Square of correlation coefficient, r2 0.4686 0.4596 0.4620 0.4687 0.4597
 Adjusted r2 0.4571 0.4503 0.4551 0.4596 0.4528
 Mean square error 0.0141 0.0143 0.0143 0.0141 0.0143
 Mean absolute deviation 0.0946 0.0949 0.0953 0.0946 0.0950
  1. **P-value < 0.01; *P-value < 0.05.
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Health and Quality of Life Outcomes

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