Measuring activities of daily living in Parkinson's disease: On a road to nowhere and back again?

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift


Parkinson's disease (PD) is a progressive neurodegenerative disorder associated with increasing disability and limitations in performance of activities of daily living (ADL) despite availability of effective symptomatic therapy. Following an overview of classical test theory (CTT) and Rasch measurement theory (RMT), the case of a clinical PD trial aiming to demonstrate ADL improvements by using the ADL section (part II) of the Unified PD Rating Scale (UPDRS) to measure ADL outcomes is considered and central questions related to its validity and interpretation are addressed. It is found that while CTT did not detect any issues, RMT in combination with conceptual considerations seriously challenged the role of the UPDRS II as an ADL outcome measure. Results are discussed from historical, methodological and clinical perspectives.


  • Peter Hagell
Enheter & grupper
Externa organisationer
  • Kristianstad University

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Neurologi


Sidor (från-till)109-124
Antal sidor16
TidskriftMeasurement: Journal of the International Measurement Confederation
StatusPublished - 2019 jan 1
Peer review utfördJa