Division of the subcohort ever employed at Icelandair according to accumulated block hours flown, estimated accumulated radiation dose, and whether ever flying over five time zones
| n | mean | |
| Accumulated block hours: | ||
| –4.999 | 77 | 2213 |
| 5.000–9.999 | 75 | 7169 |
| ⩾10.000 | 113 | 17694 |
| Accumulated radiation dose (mSv): | ||
| –2.9 | 87 | 1.3 |
| 3–9.9 | 49 | 6.7 |
| 10–19.9 | 62 | 14.8 |
| ⩾20 | 67 | 30.9 |
| Flying over five time zones | ||
| Ever | 148 | |
| Never | 117 | |