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This initial model is the hypothesized model and includes all nonspecific and PD-specific variables. Model specifics and regression coefficients are given in table 2. ADL = activities of daily living; FH = family history; HAMD = Hamilton Depression Rating Scale; IADL = Instrumental Activities of Daily Living; MMSE = Mini-Mental State Examination; PD = Parkinson disease; UPDRS = Unified Parkinson's Disease Rating Scale.
