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Depiction of final conditional latent grrowth model. PDQ = Parkinson’s Disease Questionnaire-39; AS = Apathy Scale; BDI = Beck Depression Inventory-II; QoL = Quality of Life. Measures were assessed at baseline (BL), a 6-month follow up (6) and an 18-month follow up (18). Latent predictors (motor, apathy, and depression terms) and static predictors (age, education, and gender) were allowed to correlate with each other (correlations not shown in figure).
