Demographic and clinical characteristics of patients with PD and control subjects and spectral quality measures.

<p>Values given as counts or as mean±SD, as appropriate. NA, not applicable. Statistically significant differences between patient and control groups are marked with.</p><p>*p<0.05.</p>a<p>Unified Parkinson Disease Rating Scale.</p>b<p>Signal-to-noise ratio of non-weighted spectra calculated by LCModel based on the NAA peak.