Observed (Obs) and expected (Exp) number of all cancers and malignant melanoma of the skin, SIR (95% CI) among pilots employed at Icelandair according to three categories of accumulated block hours with a requirement of a 5 year time interval before the start of follow up
| Cancer sites (ICD-7) | Obs | Exp | SIR | 95% CI |
| Accumulated block-hours 0-4999: | ||||
| All cancers (140-205) | 2 | 1.93 | 1.04 | 0.12 to 3.74 |
| Malignant melanoma of the skin (190) | 0 | 0.02 | 0.00 | — to 183.40 |
| Accumulated block-hours 5000-9999: | ||||
| All cancers (140-205) | 6 | 1.97 | 3.05 | 1.11 to 6.63 |
| Malignant melanoma of the skin (190) | 2 | 0.05 | 40.00 | 4.49 to 144.42 |
| Accumulated block-hours ⩾10000: | ||||
| All cancers (140-205) | 9 | 12.13 | 0.74 | 0.34 to 1.41 |
| Malignant melanoma of the skin (190) | 3 | 0.23 | 13.04 | 2.62 to 38.11 |
Footnotes as for table 2.