Table 1.
Demographic and Clinical Characteristics of ET Cases and Control Subjects
| Controls | ET Cases | Difference | |
|---|---|---|---|
| Number | 370 | 354 | NA |
| Age in years | 68.0 (11.5) | 67.3 (15.2) | t = 0.73, p = 0.46 |
| Female gender | 208 (56.2) | 186 (52.5) | X2 = 0.98, p = 0.32 |
| White race | 345 (93.2) | 334 (94.4) | X2 = 0.38, p = 0.54 |
| Years of education | 15.3 (3.4) Median = 16.0 |
15.1 (3.8) Median = 16.0 |
MW = 0.08, p = 0.93 |
| Number of rooms in Home/number of people living in home | 3.3 (1.7) Median = 3.0 |
3.4 (1.6) Median = 3.0 |
MW = 1.19, p = 0.23 |
| Number of live births (women) | 2.1 (1.7) Median = 2.0 |
2.1 (1.5) Median = 2.0 |
MW = 0.06, p = 0.95 |
| Years since last hospitalization | 14.5 (19.2) Median = 6.0 |
15.0 (20.7) Median = 6.0 |
MW = 0.26, p = 0.80 |
| Total tremor score | 3.8 (2.9) | 18.9 (7.2) | t = 36.14, p < 0.001 |
| First- or second-degree relative with ET or tremor | 41 (11.1) | 218 (61.6) | X2 = 200.8, p <0.001 |
| Tremor duration in years | NA | 23.5 (18.8) | NA |
| Taking a medication to treat tremor | NA | 189 (53.4) | NA |
| Surgery (thalamotomy, DBS, other) for tremor | NA | 11 (3.0) | NA |
| CIRS score | 5.5 (3.7) Median = 5.0 |
5.4 (3.6) Median = 5.0 |
MW = 0.07, p = 0.94 |
| BMI (kg/m2) | 27.7 (5.6) Median = 26.7 |
26.7 (5.0) Median = 26.3 |
MW = 2.03, p = 0.04 |
| Mean daily caloric intake (Kcal) | 1397.8 (458.8) Median = 1341.6 |
1440.3 (427.6) Median = 1420.9 |
MW = 1.69, p = 0.09 |
Mean (standard deviation) or number (percent).
BMI = body mass index, CIRS = Cumulative Illness Rating Scale, DBS = deep brain stimulation, ET = essential tremor, MW = Mann-Whitney test, NA = Not applicable.