Table 1.
Demographic and clinical characteristics of PD patients at enrollment
| Characteristics | Enrolled (n=344) |
Completersa (N=225) |
Non-completersb (N=119) |
|---|---|---|---|
| Age at enrollment, y | 61.3 (9.7) | 60.9 (9.6) | 61.9 (9.9) |
| Race (% white) | 93.6 | 95.6 | 89.9 |
| Sex (% male) | 66.3 | 67.1 | 64.7 |
| Education, y | 15.6 (3.0) | 15.5 (2.9) | 15.7 (3.1) |
| Disease duration, mo | 6.4 (6.4) | 6.6 (6.7) | 6.1 (5.8) |
| Duration since symptom onset, mo | 23.4 (21.6) | 23.1 (17.4) | 24.1 (28.0) |
| Time from symptom onset to diagnosis, mo | 17.0 (20.4) | 16.5 (16.2) | 18.1 (26.6) |
| Tremor at diagnosis, (%) | 77.0 | 75.6 | 79.8 |
| Rigidity at diagnosis, (%) | 76.2 | 78.2 | 72.3 |
| Bradykinesia at diagnosis, (%) | 82.3 | 83.6 | 79.8 |
| Postural instability at diagnosis, (%) | 7.3 | 7.6 | 6.7 |
| Family history of PD, (%) | 14.4 | 13.1 | 16.8 |
| UPDRS Part III score | 20.5 (8.7) | 20.3 (8.4) | 21.0 (9.4) |
| Hoehn and Yahr stage, median | 2.0 | 1.0 | 2.0 |
Abbreviations: PD = Parkinson disease; UPDRS = Unified Parkinson’s Disease Rating Scale. Data are given as mean (SD) for continuous variables, and percentage (%) for categorical variables.
a
Completers are those among the enrolled cases who completed all four SPECT imaging assessments.
b
Non-completers are those among the enrolled cases who completed fewer than four SPECT imaging assessments.