Item Response Theory Analysis of the MDS-UPDRS Motor Examination: Tremor vs. Nontremor Items.
Michelle Hyczy de Siqueira TosinChristopher G GoetzSheng LuoDongrak ChoiGlenn T StebbinsPublished in: Movement disorders : official journal of the Movement Disorder Society (2020)
MDS-UPDRS Part 3 tremor and nontremor items have very different relations to the construct of PD severity. Strongly improved clinimetric properties for Part 3 are obtained when tremor and nontremor items are considered separately. We suggest that evaluating PD motor severity, as an operationalized summary measure, is best attained through separate analyses with tremor and nontremor motor scores. © 2020 International Parkinson and Movement Disorder Society.
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