Table 4.

Logistic regression analysis of risk factors for URM

Y chromosome	B	S.E.M.	Wald	Sig	Exp (B)	95%CI
Y chromosome polymorphism	2.339	1.112	4.419	0.036	10.366	1.171–91.740
Shorter gestational age	–0.035	0.01	11.426	0.001	0.966	0.947–0.986
Higher frequency of miscarriage	0.831	0.357	5.425	0.02	2.295	1.141–4.617
Longer pregnancy interval	0.024	0.006	18.167	<0.001	1.024	1.013–1.036

B, β; Sig, significance; Wald, regression coefficients.