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| Patient characteristics by direction of change in diagnosis | PD to parkinsonism (n = 31) | Parkinsonism to PD (n = 27) | Multiple switches (n = 27) |
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| Age at the first visit (years), m (sd) | 68.7 (12.5) | 70.3 (9.4) | 72.6 (9.0) |
| Gender, n (column percent) | | | |
| Male | 22 (71.0) | 18 (66.7) | 20 (74.1) |
| Female | 9 (29) | 9 (33.3) | 7 (25.9) |
| Race, n (column percent) | | | |
| White | 25 (92.6) | 22 (91.7) | 23 (95.8) |
| Nonwhite | 2 (7.4) | 2 (8.3) | 1 (4.2) |
| Marital status, n (column percent) | | | |
| Married | 21 (70.0) | 20 (74.1) | 21 (77.8) |
| Not married | 9 (30.0) | 7 (25.9) | 6 (22.2) |
| Education, n (column percent) | | | |
| College or more | 20 (74.1) | 15 (71.4) | 17 (70.8) |
| Less than college | 7 (25.9) | 6 (28.6) | 7 (29.2) |
| Income, n (column percent) | | | |
| <50 k/year | 10 (43.5) | 3 (17.6) | 5 (22.7) |
| 50 k+/year | 13 (56.5) | 14 (82.4) | 17 (77.3) |
| Employment status, n (column percent) | | | |
| Not employed | 15 (50.0) | 18 (66.7) | 22 (81.5) |
| Employed | 15 (50.0) | 9 (33.3) | 5 (18.5) |
| Duration of parkinsonism at the first visit (years), m (sd) | 1.7 (2.9) | 3.9 (5.7) | 3.9 (6.0) |
| Duration of parkinsonism at follow-up (years), m (sd) | 3.7 (2.7) | 5.6 (4.1) | 5.6 (3.8) |
| First CIRS-G total score, m (sd) | 5.3 (3.0) | 6.3 (4.8) | 7.8 (4.0) |
| First UPDRS motor score, m (sd) | 27.6 (10.0) | 30.6 (14.7) | 31.7 (12.5) |
| First UPDRS total score, m (sd) | 38.7 (14.9) | 44.5 (21.5) | 48.1 (17.5) |
| Change of the clinician, n (column percent) | | | |
| No | 18 (85.7) | 15 (93.8) | 17 (81.0) |
| Yes | 3 (14.3) | 1 (6.3) | 4 (19.0) |
| Levodopa at the first visit, n (column percent) | | | |
| No | 19 (61.3) | 18 (66.7) | 16 (59.3) |
| Yes | 12 (38.7) | 9 (33.3) | 11 (40.7) |
| Levodopa at the last visit, n (column percent) | | | |
| No | 12 (38.7) | 15 (55.6) | 11 (40.7) |
| Yes | 19 (61.3) | 12 (44.4) | 16 (59.3) |
| Dopaminergic Rx at first visit, n (column percent) | | | |
| No | 16 (51.6) | 14 (51.9) | 15 (55.6) |
| Yes | 15 (48.4) | 13 (48.1) | 12 (44.4) |
| Dopaminergic Rx at the last visit, n (column percent) | | | |
| No | 10 (32.3) | 13 (48.1) | 10 (37.0) |
| Yes | 21 (67.7) | 14 (51.9) | 17 (63.0) |
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