Skip to main content

Table 5 Mapping equations from FIQR score to multi-attribute utility instruments

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

 

AQoL-8D

15D

EQ-5D-5 L

SF-6D

Coeff.

SE

Coeff.

SE

Coeff.

SE

Coeff.

SE

PANEL A

 OLS

  Constant

.778

.027***

.997

.039***

1.479

.024***

.794

.022***

  FIQR/100

−.564

.046***

−.420

.030***

  

−.383

.035***

  Age

  

−.001

.001*

    

  Squared-FIQR

    

−.898

.056***

  

 GLM

  Constant

−.144

.060*

.068

.058

.425

.025***

−.179

.039***

  FIQR/100

-1.175

.101***

−.600

.046***

  

−.670

.061***

  Age

  

−.002

.001*

    

  Squared-FIQR

    

−.824

.058***

  

PANEL B

 OLS

  Constant

.787

.031***

.950

.021***

1.496

.027***

.786

.025***

  Age

        

  FIQR_D1

  

−.138

.036***

  

−.137

.043**

  FIQR_D2

−.144

.043**

    

−.089

.034**

  FIQR_D3

−.415

.065***

−.305

.042***

  

−.149

.049**

Squared FIQR_D1

    

−.335

.081***

  

Squared FIQR_D2

    

−.167

.064**

  

Squared FIQR_D3

    

−.415

.084***

  

 GLM

  Constant

−.132

.068*

.078

.059

0.438

.028***

−.192

.044***

  Age

  

−.002

.001*

    

  FIQR_D1

  

−.156

.058**

  

−.241

.075**

  FIQR_D2

−.318

.096**

−.096

.048*

  

−.153

.059**

  FIQR_D3

−.840

.147***

−.359

.070***

  

−.264

.085**

Squared FIQR_D1

    

−.304

.081***

  

Squared FIQ_D2

    

−.167

.065**

  

Squared FIQR_D3

    

−.368

.086***

  
  1. Coeff. and SE: Beta and Standard error of significant variables (*p < 0.05, **p < 0.01; ***p < 0.001) in the equations
  2. Panel A: FIQR, Squared-FIQR, Age
  3. Panel B: FIQR function domain (FIQR_D1); FIQR overall impact domain (FIQR_D2); FIQR symptom domain (FIQR_D2); Squared FIQR function domain; Squared FIQR overall impact domain; Squared FIQR symptom domain; Age
  4. Gamma GLM: Generalized linear model Gamma log-link. EQ-5D was pre-transformed as EQ-5D + 0.66 in order to calculate the Gamma GLM with all scores (including negative values). It was post-transformed as EQ-5D – 0.66
  5. Coefficients with best fitting for equations are in bold