Clinical Utility of the Prenatal Ultrasound Score of the Placenta Combined with Magnetic Resonance Imaging in Diagnosis of Placenta Accreta during the Second and Third Trimester of Pregnancy

Table 6

Diagnostic efficacy (%).

Test variable	Accuracy rate	Sensitivity	Specificity	Positive predictive value	Negative predictive value
Ultrasound score	81.48	88.00	66.67	85.71	70.97
MRI	86.11	92.00	72.73	88.46	80.00
Combined diagnosis	92.59	94.67	87.88	94.67	87.88

Note. sensitivity = number of positive cases/total number of cases; specificity = number of negative cases/total number of cases; accuracy rate = number of accurately diagnosed cases/total number of cases; positive predictive value = number of false positive cases/total number of positive cases; negative predictive value = number of false negative cases/total number of negative cases; indicated statistically significant difference when comparing with combined diagnosis ().