Table 1 Baseline characteristics (ethanol drinkers vs non-drinkers and incident essential tremor cases vs control subjects)
Baseline characteristicsEthanol drinkersNon-drinkersIncident essential tremor casesControl subjects
n = 1838n = 1447n = 76n = 3209
Age in years (mean (SD))73.1 (6.5)***74.1 (6.7)73.7 (6.4)73.5 (6.6)
Gender (women)648 (35.3%)***1219 (84.2%)45 (59.2%)1822 (56.8%)
Educational level
    Illiterate159 (8.7%)***257 (17.8%)12 (15.8%)404 (12.6%)
    Can read and write823 (44.8%)566 (39.1%)35 (46.1%)1354 (42.2%)
    Primary studies519 (28.2%)455 (31.4%)18 (23.7%)956 (29.8%)
    Secondary studies337 (18.3%)169 (11.7%)11 (14.5%)495 (15.4%)
Cigarette smoker
    Current341 (18.6%)***53 (3.7%)5 (6.6%)389 (12.1%)
    Past773 (42.1%)141 (9.7%)21 (27.6%)893 (27.8%)
    Never723 (39.4%)1253 (86.6%)50 (65.8%)1926 (60.0%)
Cigarette pack-years24.3 (32.0)***5.0 (18.0)9.3 (17.8)**16.0 (28.6)
Depressive symptoms (screening question “Do you suffer from depression?”)417 (22.7%)***428 (29.7%)28 (36.8%)*817 (25.5%)
Use of an antidepressant medication27 (1.5%)**41 (2.8%)3 (3.9%)65 (2.0%)
Community
    Las Margaritas622 (33.8%)***497 (34.3%)38 (50.0%)**1081 (33.7%)
    Lista726 (39.5%)369 (25.5%)14 (18.4%)1081 (33.7%)
    Arévalo490 (26.7%)581 (40.2%)24 (31.6%)1047 (32.6%)
Baseline drink-years, mean (SD) (median)61.9 (70.6) (26.3)†56.7 (71.0) (16.8)
Baseline drink-years by smoking strata
    Non-smokers34.5 (51.1) (0.0)31.7 (55.8) (0.0)
    Cigarette pack-year tertile 194.9 (49.2) (98.0)80.4 (69.9) (78.0)
    Cigarette pack-year tertile 2112.0 (93.2) (114.0)91.8 (73.0) (104.0)
    Cigarette pack-year tertile 3175.5 (43.2) (156.0)*†110.0 (77.9) (116.0)
  • *p<0.05; **p<0.01; ***p<0.001 (ethanol drinkers vs non-drinkers; incident essential tremor cases vs control subjects).

  • †Mann–Whitney test.