Table 3.

Heterogeneity test.

Outcome variables	N	df	Q	I2	Tau-squared	H
T-CE	1837	23	50.100***	54.092	0.092	1.5
T-EC	2511	27	66.917***	59.652	0.083	1.6
T-EA	1490	16	60.633***	73.612	0.163	1.9
S-CE	2347	32	106.447***	69.938	0.118	1.8
S-EC	832	20	104.112***	80.790	0.291	2.3
S-EA	585	20	119.330***	83.240	0.477	2.4

N is the sum of the sample size of the ASC and TD groups;

^***p < 0.001.