Table 2 Vocal tremor case series comparative analysis
From: Isolated vocal tremor as a focal phenotype of essential tremor: a retrospective case review
Study | Year | No. of cases | Mean age | Mean duration of symptoms (years) | Female (%) | Family history (%) | Isolated vocal tremor (%) | Alcohol response (%) |
|---|---|---|---|---|---|---|---|---|
Brown et al. [11] | 1963 | 31 | 55 | 52 | 19 | |||
Koller et al. [12] | 1985 | 7 | 64 | 16 | 14 | 57 | 14 | |
Busenbark et al. [13] | 1996 | 9 | 73 | 32 | 89 | |||
Hertegard et al. [14] | 2000 | 15 | 73 | 87 | ||||
Warrick et al. [15] | 2000 | 10 | 64 | 12 | 80 | 20 | 40 | |
Adler et al. [16] | 2004 | 13 | 73 | 85 | 38 | 54 | ||
Bove et al. [17] | 2006 | 20 | 66 | 8 | 55 | 45 | 45 | |
Sulica and Louis [8] | 2010 | 34 | 70 | 7 | 93 | 38 | 56 | 27 |
Patel and Frucht | 2014 | 19 | 64 | 6 | 89 | 42 | 42 | 58 |