Table 4. Statistics to test publication bias and heterogeneity in the present meta-analysis.

Comparisons	Egger's regression analysis			Heterogeneity analysis			Model used for the meta-analysis
	Intercept	95% Confidence Interval	p-value	Q value	Pheterogeneity	I2 (%)
Pro vs. Arg	−0.65	−7.59 to 6.28	0.82	44.95	<0.0001	84.43	Random
Pro/Pro vs. Arg/Arg	−1.29	−9.14 to 6.54	0.68	26.87	<0.0001	77.67	Random
Arg/Pro vs. Arg/Arg	−1.69	−5.29 to 1.91	0.29	14.34	0.04	51.19	Random
Pro/Pro+Arg/Pro vs. Arg/Arg	−2.34	−7.37 to 2.68	0.29	27.67	<0.0001	74.70	Random
Pro/Pro vs. Arg/Arg+Arg/Pro	−0.17	−4.97 to 4.63	0.93	18.46	0.005	67.51	Random