Observed (Obs) and expected (Exp) number for all cancers, malignant melanoma of the skin and eye, and leukaemia SIR (95% CI) among pilots employed at Icelandair according to whether ever flying over five time zones with a requirement of a 5 year time interval before the start of follow up
| Cancer sites (ICD-7) | Obs | Exp | SIR | 95% CI |
| Never flying over five time zones: | ||||
| All cancers (140-205) | 12 | 8.35 | 1.44 | 0.74 to 2.51 |
| Malignant melanoma of the skin (190) | 1 | 0.11 | 9.09 | 0.12 to 50.58 |
| Eye (192) | 0 | 0.03 | 0.00 | — to 122.27 |
| Acute myeloid leukaemia (204) | 0 | 0.08 | 0.00 | — to 45.85 |
| Ever flying over five time zones: | ||||
| All cancers (140-205) | 7 | 6.70 | 1.04 | 0.42 to 2.15 |
| Malignant melanoma of the skin (190) | 4 | 0.16 | 25.00 | 6.73 to 64.00 |
| Eye (192) | 1 | 0.03 | 33.33 | 0.44 to 185.46 |
| Acute myeloid leukaemia (204) | 1 | 0.07 | 14.29 | 0.19 to 79.48 |
Footnotes as for table 2.