reached borderline significanceP = .058
The results of univariate meta-regression analysis are presented in Table 2 (with other factors’ effects being ignored): (1) the ES significantly increased gradually with respect to publication year (ES = 0.014 units/year, P = .031); (2) the ES decreased gradually with respect to the mean age of ADHD children, although it only reached borderline significance (ES = −0.041, P = .058); (3) the ES of Treat_2, Treat_3, and Treat_5 were, on average, 0.092, 0.030, and 0.151 units lower than that of Treat_1, respectively, although all of these results were not statistically significant.