In contrast to PIGD, which consistently was associated with greater severity of nondopaminergic symptoms, there was no evidence of a benign effect of tremor. Our findings do not support the use of the TD subtype as a prognostic trait in PD. The results showed that severity of PIGD is a useful indicator of severity and prognosis in PD by itself.

Daily life consequences of partial detachment of the pectoralis major muscle were acceptable in our patients.

Our findings show the robustness of a composite score of PND domains as a measure of disease severity across the disease course of PD. Composite measures of PND domains, which largely are insensitive to dopaminergic medication, may provide a more complete and accurate evaluation of disease severity and progression in PD.