Table 3. Publication bias tests (Begg’s funnel plot for publication bias test).

Genetic type	Coefficient	Standard error	t	P value	95%CI of intercept
Allelic contrast	−2.437	3.300	−0.74	0.501	(−11.599,6.726)
Homozygote comparison	−1.812	2.394	−0.76	0.491	(−8.457,4.834)
Heterozygote comparison	−3.589	1.846	−1.94	0.124	(−8.715,1.536)
Dominant genetic model	−4.313	1.946	−2.22	0.091	(−9.715,1.089)