III), which included age, sex, and age-by-sex interaction, to examine both positive (male>female) and negative (male<female) contrasts as well as positive and negative age-by-sex interactions.(III)If a significant age-by-sex interaction were found, a Pearson's correlation analysis was further performed between age and the summary network parameter in each sex group. For the analysis of the IQ-related difference, we first applied a multiple linear regression (Model III) on both IQ and each summary network parameter to model the effects of age, sex, and age-by-sex interaction; the residuals of the regression were then used to calculate the Pearson's correlation between IQ and the summary network parameters [50]. For all the analysis, the significance levels (p-values) were provided in two categories (p<0.05 and p<0.01).
