Table 3 Comparison of IOTA Simple Rules and O-RADS with histopathological findings and malignancy rates in the categories of two ultrasound classification systems
From: Efficacy of IOTA simple rules, O-RADS, and CA125 to distinguish benign and malignant adnexal masses
US Classification Systems | Total No.(%) n = 453 | Histopathological Result | Calculated malignancy rate (%) | p | |
|---|---|---|---|---|---|
Benign n = 184 | Malignant n = 269 | ||||
IOTA Simple Rules | Â | Â | Â | Â | <0.001 |
 Benign | 147 (32.45) | 132 (71.74) | 15 (5.57) | 10.20 |  |
 Malignant | 229 (50.55) | 20 (10.87) | 209 (77.70) | 91.27 |  |
 Inconclusive | 77 (17.00) | 32 (17.39) | 45 (16.73) | 58.44 |  |
O-RADS | Â | Â | Â | Â | <0.001 |
 O-RADS 2 | 78 (17.22) | 74 (40.22) | 4 (1.49) | 5.13 |  |
 O-RADS 3 | 59 (13.02) | 48 (26.09) | 11 (4.09) | 18.64 |  |
 O-RADS 4 | 134 (29.58) | 52 (28.26) | 82 (30.48) | 61.19 |  |
 O-RADS 5 | 182 (40.18) | 10 (5.43) | 172 (63.94) | 94.50 |  |