Health and Quality of Life Outcomes

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

Validation analysis dividing the sample into 5 groups (80% as predictor and 20% as predicted)
Panel A: FIQR, Squared-FIQR, Age
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
Gamma GLM: Generalized linear model Gamma log-link

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ISSN: 1477-7525

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