Table 3.
Accuracy and interrater agreement of MRI
| SEN (%) | SPEC (%) | AUROC | PPV (%) | NPV (%) | Cohen’s K coefficient | |
|---|---|---|---|---|---|---|
| MRI | 100 75,3–100 |
92,31 64,0–99,8 |
0,962 0,804–0,999 |
92,9 66,1–99,8 |
100 73,5–100 |
1,000 1,000–1,000 |
| MRI of placenta percreta | 66,7 9,4–99,2 |
95,7 78,1–99,9 |
0,812 0,611–0,937 |
66,7 9,4–99,2 |
95,7 78,1–99,9 |
0,708 0,336–1,000 |
| Uterine Bulging | 92,3 64,0–99,8 |
84,6 54,6–98,1 |
0,885 0,698–0,976 |
85,7 67,2–98,2 |
91,7 61,5–99,8 |
0,766 0,519–1,000 |
| Placental Heterogeneity | 100 75,3–100 |
100 75,3–100 |
1,000 0,868–1,000 |
100 75,3–100 |
100 75,3–100 |
0,769 0,524–1,000 |
| Dark intraplacental bands | 84,6 54,6–98,1 |
76,9 46,2–95,0 |
0,808 0,606–0,934 |
78,6 49,2–95,3 |
83,3 51,6–97,9 |
1,000 1,000–1,000 |
| Hyperintense placental lacunae | 61,5 31,6–86,1 |
58,3 27,7–84,8 |
0,599 0,386–0,788 |
61,5 31,6–86,1 |
58,3 27,7–84,8 |
0,516 0,183–0,849 |
| Interruption of the myometrium | 84,6 54,6–98,1 |
100 75,3–100 |
0,923 0,749–0,991 |
100 71,5–100 |
86,7 59,5–98,3 |
0,846 0,643–1,000 |
| Interruption of inner myometrial layer | 100 75,3–100 |
61,5 31,6–86,1 |
0,808 0,606–0,934 |
72,2 46,5–90,3 |
100 63,1–100 |
0,462 0,100–0,824 |
| Implant on uterine scar | 53,9 25,1–80,8 |
100 75,3–100 |
0,769 0,564–0,910 |
100 59,0–100 |
68,4 43,4–87,4 |
0,698 0,391–1,000 |
| Bladder tenting | 38,5 13,9–68,4 |
92,31 64,0–99,8 |
0,654 0,443–0,828 |
83,3 35,9–99,6 |
60,0 36,1–80,9 |
0,539 0,195–0,883 |
AUROC, area under the ROC curve; NPV, negative predictive value; PPV, positive predictive value;SEN, sensitivity; SPEC, specificity.
Cohen’s K coefficient: < 0 less than chance agreement; 0.01–0.20 slight agreement; 0.21– 0.40 fair agreement; 0.41–0.60 moderate agreement; 0.61–0.80 substantial agreement; 0.81–0.99 almost perfect agreement; 1 perfect agreement.