Table 2.

The results of total effect and heterogeneity test.

k	g	95% CI	Q	df	I2	Tau2
101	0.72***	[0.58, 0.86]	2309.14***	100	95.67	0.47

k is the number of independent effect size; n is the sample size; g is the Hedges's g; CI, confidence interval;

^***p < 0.001.