The Norwegian version of the QOLIBRI - a study of metric properties based on a 12 month follow-up of persons with traumatic brain injury.BACKGROUND
 The purpose was to assess the health related quality of life (HRQoL) at 12 months after a TBI in patients admitted to regional trauma centres, and to evaluate the metric properties of the Norwegian version of the Quality of Life After Brain Injury (QOLIBRI) questionnaire.


 HRQoL at 12 months post-injury was measured by the QOLIBRI.  The QOLIBRI scales had a high internal consistency (α = 0.75-0.96), and only Physical Problems had an α < 0.85.  The QOLIBRI supports an underlying unidimensional HRQoL model.  The Norwegian QOLIBRI has favourable psychometric properties, but there were some weaknesses related to its measurement properties of the total score when tested on a TBI population where many had severe TBI, and many had good recovery.
QOLIBRI
Rasch analysis, Principal Component Analysis (PCA) and Structural Equation Modelling (SEM) were applied.


 In the Rasch analysis all subscales and their items fit the Rasch model, except for the depression item in the Emotion subscale. 
Rasch analysis
Rasch analysis, Principal Component Analysis (PCA) and Structural Equation Modelling (SEM) were applied.



Principal Component Analysis (PCA)
Rasch analysis, Principal Component Analysis (PCA) and Structural Equation Modelling (SEM) were applied.



Structural Equation Modelling (SEM)