Age
| | | |
Per year increment | 1.09 (1.07 to 1.12) | 1.09 (1.06 to 1.12) | 1.12 (1.08 to 1.16) |
p Value (two tailed) for age | <0.0001 | <0.0001 | <0.0001 |
Sex
| | | |
Male* | 1.00 | 1.00 | 1.00 |
Female | 1.06 (0.73 to 1.53) | 1.09 (0.74 to 1.61) | 1.13 (0.70 to 1.83) |
p Value (two tailed) for sex | 0.77 | 0.67 | 0.62 |
Iris colour
| | | |
Dark* | 1.00 | 1.00 | 1.00 |
Light | 0.86 (0.52 to 1.42) | 0.75 (0.45 to 1.26) | 1.56 (0.75 to 3.25) |
p Value (two tailed) for iris colour | 0.56 | 0.27 | 0.23 |
Change in iris colour
| | | |
Same* | 1.00 | 1.00 | 1.00 |
Lighter | 1.36 (0.87 to 2.12) | 1.29 (0.81 to 2.07) | 1.38 (0.77 to 2.46) |
Darker | 1.19 (0.64 to 2.25) | 1.11 (0.57 to 2.16) | 1.64 (0.75 to 3.60) |
p Value (two tailed) for change in iris colour | 0.37 | 0.56 | 0.31 |
Worked/lived in sunny climate for ⩾5 years
| |
No* | 1.00 | 1.00 | 1.00 |
Yes | 1.18 (0.74 to 1.89) | 1.19 (0.72 to 1.95) | 1.30 (0.73 to 2.33) |
p Value (two tailed) for sunny climate abroad | 0.50 | 0.50 | 0.38 |
Treatment for skin tumour
| | |
No* | 1.00 | 1.00 | 1.00 |
Yes | 0.97 (0.48 to 1.98) | 1.06 (0.50 to 2.24) | 0.85 (0.32 to 2.23) |
p Value (two tailed) for skin tumour | 0.94 | 0.88 | 0.74 |
Skin sun sensitivity (skin type)
| |
Sunburn resistant* | 1.00 | 1.00 | 1.00 |
Sunburn prone | 1.24 (0.85 to 1.80) | 1.14 (0.76 to 1.70) | 1.62 (1.01 to 2.61) |
p Value (two tailed) for skin sun sensitivity | 0.27 | 0.53 | 0.05 |
Hair colour
| | | |
Dark* | 1.00 | 1.00 | 1.00 |
Light | 1.19 (0.80 to 1.76) | 1.25 (0.83 to 1.89) | 1.26 (0.75 to 2.11) |
p Value (two tailed) for hair colour | 0.39 | 0.29 | 0.38 |
Sun exposure index
| | | |
Per unit increment | 1.00 (0.99 to 1.00) | 1.00 (0.99 to 1.00) | 1.00 (0.99 to 1.00) |
p Value (two tailed) for sun exposure | 0.42 | 0.44 | 0.29 |
Sun avoidance measures undertaken
| |
Yes* | 1.00 | 1.00 | 1.00 |
No | 1.00 (0.58 to 1.72) | 0.94 (0.53 to 1.68) | 1.14 (0.57 to 2.30) |
p Value (two tailed) for sun avoidance | 1.00 | 0.84 | 0.71 |
Pack years of smoking
| | |
0* | 1.00 | 1.00 | 1.00 |
0.1–20 | 0.82 (0.55 to 1.21) | 0.76 (0.50 to 1.15) | 0.84 (0.50 to 1.40) |
20.1–40 | 1.60 (0.99 to 2.52) | 1.46 (0.90 to 2.39) | 1.74 (0.96 to 3.16) |
>40 | 2.68 (1.36 to 5.29) | 2.42 (1.19 to 4.92) | 3.60 (1.59 to 8.18) |
p Value (two tailed) for pack years | 0.001 | 0.003 | 0.001 |