Table 2.
Patient and tumour characteristics by diagnosis type: for continuous variables, figures in table represent median (range) with corresponding p-value from the Wilcoxon rank-sum test, and for categorical variables, figures in table represent n (%) with corresponding p-value from the χ2 test
| Characteristic | Non-incidental (n=231) | Incidental (n=351) | P value |
| Age (years) | 62 (33–92) | 65 (29–90) | 0.04 |
| Gender | |||
| Female | 77 (38.3) | 124 (61.7) | |
| Male | 154 (40.4) | 227 (59.6) | 0.69 |
| BMI | 28.3 (15.6–67.2) | 27.8 (17.2–57.7) | 0.38 |
| Tumour size (path) (mm) | 75 (13–240) | 42 (11–170) | <0.01 |
| Tumour size (CT) (mm) | 80 (16–250) | 44 (10–170) | <0.01 |
| pT | |||
| 1a | 25 (12.8) | 170 (87.2) | |
| 1b | 48 (37.2) | 81 (62.8) | |
| 2 | 46 (60.5) | 30 (39.5) | |
| 3 | 101 (61.2) | 64 (38.8) | |
| 4 | 4 (100) | 0 (0) | |
| X | 0 (0) | 2 (100) | |
| Missing | 0 (0) | 1 (100) | |
| NA* | 7 (70) | 3 (30) | <0.01 |
| Grade | |||
| 1 | 6 (66.7) | 3 (33.3) | |
| 2 | 56 (35.9) | 100 (64.1) | |
| 3 | 93 (34.6) | 176 (65.4) | |
| 4 | 65 (75.6) | 21 (24.4) | |
| Missing | 6 (26.1) | 17 (73.9) | |
| NA* | 5 (12.8) | 34 (87.2) | <0.01 |
| Stage | |||
| I | 70 (21.6) | 254 (78.4) | |
| II | 42 (60.9) | 27 (39.1) | |
| III | 80 (58.4) | 57 (41.6) | |
| IV | 39 (78) | 11 (22) | |
| Missing | 0 (0) | 2 (100) | <0.01 |
| Tumour subtype | |||
| Clear cell | 186 (40.9) | 269 (59.1) | |
| Papillary | 21 (35.6) | 38 (64.4) | |
| Chromophobe | 19 (41.3) | 28 (58.7) | |
| Unclassified | 5 (27.8) | 13 (72.2) | |
| Other | 0 (0) | 3 (100) | 0.62 |
*Not applicable (NA), patients underwent biopsy only or tumour ablation.
BMI, body mass index.