Table 5 Subgroup analysis of MRI-based prediction model
Subgroup | N (%) | Sensitivity (%) | Specificity (%) | Accuracy (%) | PPV (%) | NPV (%) |
|---|---|---|---|---|---|---|
Number | Â | Â | Â | Â | Â | Â |
 Unifocal nodules subgroup | 252(30.5) | 93.2 | 81.1 | 88.9 | 89.9 | 86.9 |
 Multifocal nodules subgroup | 573(69.5) | 96.1 | 95.7 | 95.8 | 89.2 | 98.5 |
Hashimoto′s thyroiditis |  |  |  |  |  |  |
 Hashimoto′s thyroiditis subgroup | 137(16.6) | 94.6 | 96.8 | 95.6 | 97.2 | 93.8 |
 Non-Hashimoto′s thyroiditis subgroup | 688(83.4) | 94.7 | 92.6 | 93.3 | 87.5 | 96.9 |
Size | Â | Â | Â | Â | Â | Â |
 Small nodules subgroup (0.5-1 cm) | 272 (33.0) | 96.5 | 87.0 | 91.9 | 88.9 | 95.8 |
 Medium nodules subgroup (1-4 cm) | 452 (54.8) | 97.4 | 95.3 | 96.0 | 91.6 | 98.6 |
 Large nodules subgroup (≥4 cm) | 101 (12.2) | 60.0 | 95.1 | 88.1 | 75.0 | 90.6 |