Table 2. Egger’s test of publication bias between selected studies.

Std eff	Coef	Std err	t	P > |t|	95% CI
Slope	−0.002	0.641	0.000	0.998	−1.451, 1.448
Bias	−2.577	1.782	−1.450	0.182	−6.608, 1.453

Std eff, standard efficiency; Coef, coefficient; Std err, standard error; t, t test; P > |t|, 2-tailed P value; CI, confident intervals.