Table 3. Publication bias test for the MTHFR C677T polymorphism.

Comparisons	Egger test			Begg test
	Coefficient	P value	95% CI	P value
T vs. C	-0.04	0.99	-7.51 7.42	0.47
TT vs. CC	-0.09	0.91	-1.85 1.68	0.12
TT vs. CC+CT	-0.05	0.77	-0.44 0.34	0.75
CT+TT vs. CC	-1.8	0.51	-7.98 4.38	0.47