Table 1.
Patient characteristics of the study cohort (n = 98).
| Age | Mean | 64.4 (±11.9) |
| Gender | Male | 78 (79%) |
| Female | 20 (21%) | |
| Event | Relapse | 45 (46%) |
| Non-relapse | 53 (54%) | |
| Follow-up [months] | Mean | 15.7 (±14.6) |
| Stage [previously resected tumor] | Papilloma | 4 |
| Tis | 2 | |
| Ta | 74 | |
| T1 | 10 | |
| T2 | 2 | |
| T3 | 1 | |
| Tx | 5 | |
| Grade [previously resected tumor] | G1 | 22 |
| G2 | 48 | |
| G3 | 17 | |
| Gx | 2 | |
| Unknown | 9 | |
| Multiplicity [previously resected tumor] | Solitary | 51 |
| Multiple | 37 | |
| Unknown | 10 |
No significant differences were detected with regards to age, gender, and number of events between the training and the test set.