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Table 4 Goodness-of-fit results from validation analysis

From: “Fibromyalgia and quality of life: mapping the revised fibromyalgia impact questionnaire to the preference-based instruments”

PANEL A
Instruments N Method Mean Utility Min Utility Max Utility MAE RMSE
AQoL-8D 177 Observed 0.465 0.155 0.945 - -
OLS 0.465 0.214 0.751 0.099 0.126
Gamma GLM 0.465 0.269 0.837 0.096 0.124
15D 192 Observed 0.688 0.391 1.000 - -
OLS 0.688 0.484 0.927 0.070 0.087
Gamma GLM 0.688 0.511 0.965 0.069 0.087
EQ-5D-5 L 191 Observed 0.490 −0.480 1.000 - -
OLS 0.490 −0.076 0.814 0.138 0.174
Gamma GLM 0.489 0.016 0.871 0.137 0.175
SF-6D 141 Observed 0.561 0.345 1.000 - -
OLS 0.560 0.415 0.739 0.064 0.081
Gamma GLM 0.560 0.431 0.756 0.064 0.081
PANEL B
Instruments N Method Mean Utility Min Utility Max Utility MAE RMSE
AQoL-8D 177 Observed 0.465 0.155 0.945 - -
OLS 0.465 0.218 0.808 0.098 0.124
Gamma GLM 0.465 0.271 0.901 0.097 0.124
15D 192 Observed 0.688 0.391 1.000 - -
OLS 0.689 0.498 0.942 0.072 0.089
Gamma GLM 0.689 0.521 0.985 0.071 0.089
EQ-5D-5 L 191 Observed 0.490 −0.480 1.000 - -
OLS 0.491 −0.085 0.843 0.138 0.174
Gamma GLM 0.490 0.014 0.891 0.137 0.175
SF-6D 141 Observed 0.561 0.345 1.000 - -
OLS 0.559 0.411 0.743 0.066 0.084
Gamma GLM 0.559 0.428 0.761 0.067 0.084
  1. Validation analysis dividing the sample into 5 groups (80% as predictor and 20% as predicted)
  2. Panel A: FIQR, Squared-FIQR, Age
  3. Panel B: FIQR function domain; FIQR overall impact domain; FIQR symptom domain; Squared FIQR function domain; Squared FIQR overall impact domain; Squared FIQR symptom domain; Age
  4. Gamma GLM: Generalized linear model Gamma log-link