1. | Have ever had freckles | 101 | 42.3 | 189 | 41.6 | 0.87 |
2. | Red hair colour | 15 | 6.3 | 26 | 5.7 | 0.77 |
3. | Blue or green eye colour | 219 | 91.6 | 395 | 87.0 | 0.07 |
4. | Number of naevi | | | | | |
| 0–20 | 159 | 66.5 | 335 | 73.8 | |
| 21–100 | 67 | 28.0 | 87 | 19.2 | |
| More than 100 | 13 | 5.4 | 19 | 4.2 | <0.05 |
5. | Skin reactions when sunbathing | | | | | |
| Always burn, never tan | 11 | 4.6 | 15 | 3.3 | |
| Always burn, occasionally tan | 28 | 11.7 | 55 | 12.1 | |
| Occasionally burn, always tan | 176 | 73.6 | 306 | 67.4 | |
| Never burn, always tan | 21 | 8.8 | 67 | 14.8 | <0.20 |
6. | History of severe sunburn after the age of 19 | | | | | |
| Never | 28 | 11.7 | 88 | 19.4 | |
| 1–5 times | 143 | 59.8 | 265 | 58.4 | |
| More than 5 times | 68 | 28.5 | 97 | 21.4 | <0.02 |
7. | History of severe sunburn before the age of 19 | | | | | |
| Never | 69 | 28.9 | 147 | 32.4 | |
| 1–5 times | 125 | 52.3 | 220 | 48.5 | |
| More than 5 times | 42 | 17.6 | 75 | 16.5 | <0.70 |
8. | Use of sunbeds/sunlamps | | | | | |
| Never | 114 | 47.7 | 163 | 35.9 | |
| 1–10 times | 69 | 28.9 | 136 | 30.0 | |
| 10–100 times | 55 | 23.0 | 129 | 28.4 | |
| More than 100 times | 2 | 0.8 | 26 | 5.7 | <0.001 |
9. | Use of sunscreen | | | | | |
| Never | 35 | 14.6 | 124 | 27.3 | |
| Occasionally | 135 | 56.5 | 265 | 58.4 | |
| Always | 69 | 28.9 | 61 | 13.4 | <0.001 |
10. | Sunny vacation | | | | | |
| Never | 24 | 10.0 | 106 | 23.3 | |
| 1–10 times | 127 | 53.1 | 283 | 62.3 | |
| 11–20 times | 34 | 14.2 | 41 | 9.0 | |
| More than 20 times | 54 | 22.6 | 23 | 5.1 | <0.001 |
11. | Travel abroad | | | | | |
| Never | 4 | 1.7 | 37 | 8.1 | |
| 1–5 times | 16 | 6.7 | 181 | 39.9 | |
| 6–20 times | 39 | 16.3 | 165 | 36.3 | |
| More than 20 times | 180 | 75.3 | 68 | 15.0 | <0.001 |
12. | Skin cancer among relatives: yes | 25 | 10.5 | 26 | 5.7 | 0.02 |
13. | Many naevi among relatives: yes | 61 | 25.5 | 107 | 23.6 | 0.57 |