Table 3. 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	−1.56	−7.40 to 4.26	0.56	70.75	<0.0001	84.45	Random
Pro/Pro vs. Arg/Arg	−1.61	−6.48 to 3.26	0.47	45.35	<0.0001	77.95	Random
Arg/Pro vs. Arg/Arg	−2.72	−5.95 to 0.51	0.09	30.12	0.002	63.48	Random
Pro/Pro+Arg/Pro vs. Arg/Arg	−3.38	−7.58 to 0.82	0.10	48.78	<0.0001	77.45	Random
Pro/Pro vs. Arg/Arg+Arg/Pro	−0.49	−3.70 to 2.72	0.73	31.08	0.001	67.83	Random