Table 5 Simulation statistics of the analyses of the indirect effects in the mediation tests, testing mediation effects of EF on the intervention effects on TEC (TEC-by-EF), Language (Language-by-EF), Math (Math-by-EF), the mediation effect of Language on the intervention effect on EF (EF-by-Language), and the mediation effect of Math on the intervention effect of EF (EF-by-Math)