Table 1.
Selection from entry cohort to samples of analysis
| Sample | Cohort 1996–97 | Cohort 2003–04 | Total | |||
|---|---|---|---|---|---|---|
| N | % | N | % | N | % | |
| Entry cohort | 389 | 100,0 | 488 | 100,0 | 877 | 100,0 |
| ./. loss-to-follow up | 0 | 0,0 | 17 | 3,5 | 17 | 1,9 |
| ./. No stage information availablea | 1 | 0,3 | 2 | 0,4 | 3 | 0,3 |
| ./. Stage 0b | 22 | 5,7 | 33 | 6,8 | 55 | 6,3 |
| ./. Mx, M1c | 20 | 5,1 | 26 | 5,3 | 46 | 5,2 |
| ./. Missings on marginal resectiond | 1 | 0,3 | 12 | 2,5 | 13 | 1,5 |
| Institutional-invasive sample | 345 | 88,7 | 398 | 81,6 | 743 | 84,7 |
| ./. Non-residents | 107 | 27,5 | 132 | 27,0 | 239 | 27,3 |
| Regional-invasive sample | 238 | 61,2 | 266 | 54,5 | 504 | 57,5 |
Legend: arefers to non-assessable stage information, bexcludes non tissue invasive tumors (pTis), cexcluded all non-assessable metastasis status or distant metastasis, dpatients without any information are excluded