Table 2.

Egger's regression coefficient test and classic fail-safe N test results (these tests, along with the funnel pot are to determine if there is publication bias).

Variable	Egger's regression intercept					Classic fail-safe N
	Intercept	SE	t	df	P	Z	P	N
PSM	−3.430	1.471	2.331	26	0.027	64.791	0.000	10,570

SE, Standard error of the average effect size; df, degree of freedom; P, Testing the likelihood of the null hypothesis holding; Z, Extent of deviation from variance; N, Number of missing studies that would bring p-value to >alpha.