Table 1

Patient characteristics at baseline in the follow-up and lost to follow-up groups

Follow-upLost to follow-up
Demographics
 n814
 Age (mean±SD)57±13.157±17.0
 Female44 (54%)2 (50%)
 UPDRS motor score mean±SD10.3±4.28.4±5.9
 Hoehn and Yahr stage mean±SD1.6±0.761.1±0.25
 MMSE mean±SD28.9±1.629.0±1.4
Scan results
 Abnormal 18F-AV-133 PET scan42 (52%)2 (50%)
Baseline prescan diagnosis
Neurodegenerative conditions 45 2
  Parkinson’s disease311
  Multiple system atrophy11
  Progressive supranuclear palsy1
  Corticobasal syndrome1
  Alzheimer’s disease1
  Undefined10
Non-degenerative conditions 36 2
  Functional132
  Dystonia100
  Drug-induced parkinsonism50
  Essential tremor30
  Monosymptomatic resting tremor30
  Vascular parkinsonism10
  Rubral tremor10
  • MMSE, Mini Mental State Examination; PET, positron emission tomography; UPDRS, Unified Parkinson’s Disease Rating Scale.