Table 2. First Incident of Invasive Cutaneous Squamous Cell Carcinoma by Sex and Duration of Follow-up.
| Duration of follow-up, y | Cases, No. | SIR (95% CI) | Person-years at risk | AER (95% CI) | |
|---|---|---|---|---|---|
| Observed | Expected | ||||
| Men | |||||
| 2-5 | 1861 | 210 | 8.8 (8.4-9.3) | 77 222 | 214 (203-224) |
| 6-10 | 962 | 133 | 7.3 (6.8-7.7) | 44 031 | 188 (176-201) |
| 11-29 | 564 | 94 | 6.0 (5.5-6.5) | 25 556 | 184 (167-201) |
| Total | 4673 | 515 | 9.1 (8.8-9.3) | 176 705 | 235 (228-242) |
| Women | |||||
| 0-1 | 1030 | 68 | 15.1 (14.2-16.1) | 45 613 | 211 (198-224) |
| 2-5 | 1736 | 197 | 8.8 (8.4-9.2) | 124 669 | 123 (117-130) |
| 6-10 | 1062 | 135 | 7.9 (7.4-8.4) | 75 621 | 123 (115-130) |
| 11-29 | 653 | 98 | 6.7 (6.2-7.2) | 44 931 | 124 (113-134) |
| Total | 4481 | 498 | 9.0 (8.7-9.3) | 290 834 | 137 (133-141) |
Abbreviations: AER, absolute excess risk per 10 000 person-years; SIR, standardized incidence ratio.