Validity of Web-Based Questionnaire (PD Only) With regard to construct validity, there was a highly significant negative association between the Visual and Visuospatial summary score from the web-based questionnaire and the z -score derived from performance on the objective visuospatial tests (composite score derived from Line Bisection, Road-Map, JLO) ( r = −0.59, P < 0.003).
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Web-based assessment of visual and visuospatial symptoms in Parkinson's disease.
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