Table 2.
Demographic and clinical characteristics of the sample are shown in table 2
| Observation | Free-text sample (n=3055) | Marched-pair samples (2992) | ||||
| CUP (n=1496) | Non-CUP (n=1496) | |||||
| Age | ||||||
| Mean (SD) | 65.3 (11.3) | 66.5 (11.7) | 66.6 (11.5) | |||
| Median (IQR) | 66 (58, 73) | 67 (59, 75) | 67 (59, 75) | |||
| Range | 16, 95 | 20, 98 | 23, 94 | |||
| Sex | n | % | n | % | n | % |
| Male | 1121 | 36.7 | 583 | 39.0 | 583 | 39.0 |
| Female | 1934 | 63.3 | 913 | 61.0 | 913 | 61.0 |
| Diagnosis | ||||||
| CUP | 3055 | 100 | 1496 | 100 | – | |
| Breast | – | 111 | 7.4 | |||
| Head and neck | – | 185 | 12.4 | |||
| Lung | – | 271 | 18.1 | |||
| Pancreatic | – | 44 | 2.9 | |||
| Prostate | – | 52 | 3.5 | |||
| Renal | – | 89 | 5.9 | |||
| Upper and lower GI | – | 744 | 49.7 | |||
| ICD-10 codes | ||||||
| C77 | 514 | 16.8 | 399 | 27 | – | – |
| C78 | 1172 | 38.4 | 496 | 33 | – | – |
| C79 | 1209 | 39.6 | 435 | 29 | – | – |
| C80 | 160 | 5.2 | 166 | 11 | – | – |
CUP, cancer of unknown primary; ICD-10, International Classification of Diseases 10th Revision.