Neuro-QoL measures are scored on the T-score metric. High scores mean more of the concept being measured.
PROMIS®, Neuro-QoL, ASCQ-MeSM, and many of the NIH Toolbox® measures use a T-score metric in which 50 is the mean of a relevant reference population and 10 is the standard deviation (SD) of that population.
On the T-score metric:
- A score of 40 is one SD lower than the mean of the reference population.
- A score of 60 is one SD higher than the mean of the reference population.
Direction of Scores
For Neuro-QoL measures, higher scores equals more of the concept being measured (e.g., more Fatigue, more Lower Extremity Function - Mobility). Thus a score of 60 is one standard deviation above the average referenced population. This could be a desirable or undesirable outcome, depending upon the concept being measured.