showed a trendp = 0.067
The SZ and controls showed no significant differences with respect to the mean densities of Olig2-positive oligodendrocytes in the investigated subregions of the posterior part of the hippocampus, but the density of parvalbumin-stained interneurons was increased in the left CA1 region in the SZ (+124%, p = 0.033) and showed a trend towards an increase in the right CA4 (+175%, p = 0.067; see Figure 4 ).