Prevalence and Factors Associated with Drooling in Parkinson’s Disease: Results from a Longitudinal Prospective Cohort and Comparison with a Control Group

Figure 1

(a) Percentage of patients (the whole cohort and the group with no more than 2 years since symptom onset (PD ≤ 2 y) and controls reporting drooling at different visits: V0, V1, and V2. (b) Prevalence of drooling during the follow-up period in all patients and in the PD ≤ 2 y group who completed the three visits (V1, V2, and V3) and percentage of cases presenting drooling in only 1 visit, 2 visits, and all visits. PD cohort vs. controls at V0,  < 0.0001; PD cohort vs. controls at V2,  < 0.0001; PD ≤ 2 y group vs. controls at V0,  < 0.0001; PD ≤ 2 y group vs. controls at V2,  < 0.0001. PD: Parkinson’s disease. PD ≤ 2 y group: patients with ≤2 years since symptom onset.

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