Table 3.
Severity of tremor in hand-drawn spirals in two control samples
| Population-Based Study in Northern Manhattan |
Study of the Environmental Epidemiology of ET |
|
|---|---|---|
| N | 268 | 429 |
| Hand-drawn spiral rating >2 in dominant arm 1 | 8/268 (3.0) | 0/429 (0.0) |
| Hand-drawn spiral rating >2 in either arm1 | 18/268 (6.7) | 0/429 (0.0) |
| Hand-drawn spiral rating >2 in both arms1 | 1/268 (0.4) | 0/429 (0.0) |
| Hand-drawn spiral rating >1.5 in dominant arm1 | NAv 2 | 6/429 (1.4) |
| Hand-drawn spiral rating >1.5 in either arm1 | NAv 2 | 20/429 (4.7) |
| Hand-drawn spiral rating >1.5 in both arms1 | NAv 2 | 4/429 (0.9) |
| Correlation between hand-drawn spiral rating (dominant arm) and total tremor score3 | 0.45, p <0.001 | 0.52, p<0.001 |
| Answered “yes” to the question, “Does your hand usually tremor when you hold a pen or write your name?” 1 | 10/268 (3.7) | 5/429 (1.2) |
Values are proportions (percentage).
In some controls, data are missing.
1
The proportions in this row (p) may be converted to specificities by using the formula specificity = 100 – p.
2
Tremor rating = 1.5 was not assigned in this study protocol.
3
Spearman’s correlation coefficient, p value.