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. Author manuscript; available in PMC: 2012 Mar 27.
Published in final edited form as: J Commun Disord. 2008 Feb 29;41(6):485–500. doi: 10.1016/j.jcomdis.2008.02.001

Table 4.

Mean and standard deviation of D2, percent jitter, percent shimmer, signal-to-noise ratio (SNR), F0, vF0, and vAm for non-pathologic patients (n = 11), non-surgical (control) PD patients (n = 10), and surgical (DBS of the STN) PD patients (n = 19)

Non-pathologic
Non-surgical
Surgical
Males (n = 5) Females (n = 6) Overall (n = 11) Males (n = 4) Females (n = 6) Overall (n = 10) Males (n = 11) Females (n = 8) Overall (n = 19)
D2 2.282 (±0.671) 2.064 (±0.327) 2.151 (±0.494) 3.475 (±0.287) 3.642 (±0.716) 3.575 (±0.565) 2.424 (±0.449) 2.957 (±0.881) 2.648 (±0.698)
Percent jitter 0.325 (±0.117) 0.427 (±0.240) 0.609 (±0.410)
Percent shimmer 2.434 (±1.724) 7.009 (±3.405) 6.615 (±2.841)
SNR 22.282 (±3.902) 14.062 (±5.252) 14.120 (±4.329)
F0 206.94 (±34.84) 262.84 (±61.99) 226.70 (±64.28) 157.20 (±31.97) 194.96 (±26.21) 182.37 (±32.27) 143.18 (±16.27) 178.34 (±27.53) 157.98 (±27.56)
vF0 1.355 (±0.431) 6.708 (±8.322) 1.816 (±1.198)
vAm 9.107 (±3.107) 10.885 (±2.289) 9.894 (±4.800)

Mean D2 and F0 values are also given by gender.