a nonsignificant trendp = 0.02
Group differences in regional volumes Group comparisons ( t -tests) showed right putamen volume loss (HC: M = 0.35, SD = 0.05; PD-woMCI: M = 0.33, SD = 0.04; p = 0.005) and a nonsignificant trend for left putamen volume loss (HC: M = 0.36, SD = 0.06; PD-woMCI: M = 0.34, SD = 0.04; p = 0.02) in the PD-woMCI group.