Table 4.

Meta‐regression analysis of potential source of heterogeneity

Factors	Coefficient	SE	t	P value	95% CI
					LL	UL
Age	0.111	0.040	2.77	0.221	−0.398	0.619
Gender	−0.012	0.040	−0.29	0.818	−0.514	0.490
Ethnicity	0.622	0.520	1.20	0.443	−5.983	7.226
Sample size	0.000	0.001	0.22	0.865	−0.013	0.014
Genotype method	0.249	1.327	0.19	0.882	−16.611	17.109
Language	−0.796	0.343	−2.32	0.259	−5.15	3.56

SE, standard error; UL, upper limit; LL, lower limit.