Differential Diagnosis of Cesarean Scar Pregnancies and Other Pregnancies Implanted in the Lower Uterus by Ultrasound Parameters

Table 3

Results of the logistic regression model.

Risk factor	Regression coefficient	Standard error	Wald chi-square value	value	OR
Gestational sac in relation to the scar	1.599	0.827	3.739	0.053	4.946
Trophoblastic blood flow			6.051	0.049
Type I^a	1.846	1.126	2.685	0.101	6.332
Type II^b	2.048	0.837	5.993	0.014	7.755
Thickness of the residual muscle	-0.755	0.309	5.967	0.015	0.470
Constant	-1.900	1.992	0.909	0.340	0.150

^aComparison between the trophoblastic blood from the lower posterior uterus and unknown; ^bcomparison between the trophoblastic blood from the lower posterior uterus and the lower anterior uterus.