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. 2011 Jan 26;119(6):866–872. doi: 10.1289/ehp.1002839

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Screening process of cases and controls. We identified 170 suspect cases and 644 potential controls and screened 156 (92%) and 542 (84%) of these, respectively. We conducted study evaluations in 137 (88%) of eligible suspect cases (including four initially identified as potential controls who self-reported PD at screening) and 383 (71%) of eligible potential controls. Suspect cases were evaluated in home visits or from medical records, matched controls in home visits. Final diagnoses in suspect cases were PD (115), essential tremor/other tremor disorder (12), no neurologic diagnosis (5), dystonia (2), multiple system atrophy (2), and atypical parkinsonism not fulfilling any diagnostic criterion (1). The latter three cases were subsequently termed “atypical parkinsonism.”