from Section 5: - Objectifying Movement Disorders
Published online by Cambridge University Press: 07 January 2025
Measurement is an essential activity in neurology, as it allows for collecting and sharing data that can be used for description, comparison and decision making regarding the health status of patients. The adequate assessment of motor and functional signs and symptoms of movement disorders must be done with instruments that have been developed and tested following a standardized methodology. The validation of a scale or instrument is an iterative process that includes several phases and the testing of a number of psychometric properties following the principles of the Classical Test Theory or the Latent Test Theory, each with its own methods and statistical procedures. In this chapter, we review the characteristics and psychometric properties of the main measurement instruments and scales for assessing motor and functional symptoms in movement disorders, particularly those recommended by the Movement Disorders Society.
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