groups in the FA of callosal fiber in the segment which identified the significant relation in regression analysis in the SZ group. The statistical significance level was set at p < 0.05/number of tests (adjusted for the Bonferroni correction). In the same approach, stepwise multiple regression analysis was also performed with other DTI index, which includes the ADC, AD, and RD of callosal fibers in each segment as independent variables. All statistical analyses were performed using the IBM SPSS Statistics for Windows (IBM Japan, Ltd.).
