showed a trendp = 0.067
For the summary score incorporating all the axial symptoms from the UPDRS, basal ganglia GABA levels showed a trend-level association in the full patient group (Spearman's rho = 0.441, p = 0.067), which was significant in the subgroup of akinetic rigid patients (Spearman's rho = 0.671, p = 0.034), but not in the subgroup of tremor-dominant patients (Spearman's rho = 0.345, p = 0.403).