Physiological characteristics of postural tremors

VariableETA(n=20)ET/PDB(n=7)PDC(n=18)p Value
Latency (s) 0.06 (0.28)  4.70 (7.57) 6.25 (9.76)AB <0.01
(0–1.29) (0–23.0)(0–47.0)AC <0.01
Frequency (Hz) 5.50 (0.88)  5.75 (1.23) 5.47 (1.24)NS
(3.5–7.2) (4.3–7.7)(4.1–9.6)
Acceleration (g2) at peak frequency 0.52 (1.07) 11.20 (10.70) 3.83 (6.82)AB <0.0001
(0.002–4.23) (0.02–28.74)(0.004–26.93)AC <0.05
RMS (g) 0.051 (0.053)  0.28 (0.25) 0.186 (0.115)AC <0.0001
(0.013–0.217) (0.07–0.75)(0.013–0.370)AB <0.0005
  • Values represent means (SD) (range); AB refers to a comparison between ET and ET/PD, AC refers to a comparison between ET and PD.