Table 5. Meta-regression analysis coefficients for salivary s-IgA levels in the examined group of studies.

Variables	Coefficient (SE)	95% Confidence interval	P
Region	−0.06 (0.37)	−0.83; 0.71	0.86
Age	−0.45 (1.09)	−2.71; 1.81	0.68
Dentition Periods	0.55 (0.63)	−0.74; 1.84	0.38
Detection method	−0.45 (0.44)	−1.35; 0.45	0.31