Table 4.

The results of logistic regression model

Parameter	β	Wald χ2	OR	95% CI		P value
Intercept	-18.8623	18.758	\	\	\	<0.0001
Uterine peristalsis	0.9532	4.3373	2.594	1.058	6.361	0.0373
Uterine spiral artery	1.5737	8.6038	4.825	1.686	13.808	0.0034
Ultrasound elastography	3.9092	13.5489	49.857	6.219	399.69	0.0002
Age	0.154	4.5351	1.167	1.012	1.344	0.0332