Table 3.

Meta-regressions.

	No. of Studies	β Coefficient	SE	95% CI		Z-Value	P value
Mean age	12	−0.04	0.07	−0.18	0.10	−0.51	0.61
NOS score	27	0.22	0.16	−0.10	0.53	1.35	0.18
% Married	12	1.23	0.58	0.08	2.37	2.10	0.04*
% Primiparous	14	0.00	0.01	−0.02	0.01	−0.39	0.70