Table 2 The characteristics of patients and lymph nodes
Characteristics | Model development dataset | Hold-out test dataset | P value | |||||
|---|---|---|---|---|---|---|---|---|
Training set | Validation set | Testing set | P value | Patients with suspicious LNs | Patients without suspicious LNs | P value | ||
No. of patients | 309 | 43 | 41 | – | 37 | 40 | – | – |
Age, mean ± SD (years) | 70.3 ± 9.6 | 71.2 ± 7.3 | 70.8 ± 8.8 | 0.785 | 69.4 ± 8.8 | 71.4 ± 8.4 | 0.305 | 0.990 |
PSA, median (ng/ml) | 13.00 (7.13,23.43) | 14.21 (8.20, 26.73) | 12.20 (7.42, 21.30) | 0.552 | 15.49 (9.25, 26.65) | 10.69 (7.10, 18.82) | 0.031 | 0.088 |
No. of annotated LNs | 8139 | 1258 | 1110 | – | – | – | – | – |
Average LNs per patient | 27 (5, 30) | 29 (6, 33) | 27 (3, 35) | 0.537 | – | – | – | – |
No. of suspicious LNs | 1374 | 186 | 230 | – | 201 | – |  |  |
Short diameter of largest LNs (cm) | 0.83 ± 0.30 | 0.93 ± 0.33 | 0.83 ± 0.29 | 0.145 | – | – | – | – |
Volume of largest LNs (cm3) | 9.03 (4.60, 17.32) | 10.93 (5.30, 17.40) | 7.09 (5.37, 14.08) | 0.628 | – | – | – | – |
Scanners | Â | Â | Â | Â | Â | Â | Â | Â |
3.0 T Achieva | 96 | 16 | 12 | – | 12 | 15 | – | – |
3.0 T Discovery | 113 | 13 | 15 | – | 14 | 13 | – | – |
3.0 T Interia | 100 | 14 | 14 | – | 11 | 12 | – | – |