|  | % Persistently |  |  |  |  |  |
---|---|---|---|---|---|---|---|
 |  | Tanned | Univariate |  |  | Multivariate |  |
Characteristic | N | Indoors | OR (95% CI) | P valuea | N | OR (95% CI) | P valueb |
Eye color | Â | Â | Â | Â | Â | Â | Â |
   Brown | 71 | 28 | 1.00 | 0.431 |  |  |  |
   Hazel | 36 | 28 | 0.98 (0.40 - 2.40) |  |  |  |  |
   Green | 14 | 29 | 1.02 (0.29 - 3.63) |  |  |  |  |
   Blue/grey | 49 | 16 | 0.50 (0.20 - 1.25) |  |  |  |  |
Skin color | Â | Â | Â | Â | Â | Â | Â |
   Olive | 33 | 27 | 1.00 | 0.902 |  |  |  |
   Fair | 106 | 24 | 0.82 (0.34 2.0) |  |  |  |  |
   Very fair | 31 | 26 | 0.93 (0.31 - 2.82) |  |  |  |  |
Skin reaction with first summer sun exposure | Â | Â | Â | Â | Â | Â | Â |
   Sunburn | 76 | 18 | 1.00 | 0.085 |  |  |  |
   Tan | 94 | 30 | 1.88 (0.91 - 3.90) |  |  |  |  |
Skin reaction with prolonged sun exposure | Â | Â | Â | Â | Â | Â | Â |
   Deep Tan | 35 | 40 | 1.00 | 0.023 | 35 | 1.00 | 0.031 |
   No/Mild/Moderate Tan | 135 | 21 | 0.39 (0.18 - 0.87) |  | 135 | 0.39 (0.16 - 0.91) |  |
BMI (kg/m2) | 170 | - | 1.02 (0.96 - 1.08) | 0.535 | Â | Â | Â |
Pounds Gained since age 18 (per 10 lbs) | 170 | - | 1.14 (0.86 - 1.49) | 0.364 | Â | Â | Â |
Alcoholic drinks under age 25 (per 300 drinks) | 170 | - | 1.05 (1.01 - 1.09) | 0.015 | 170 | 1.05 (1.01 -1.09) | 0.015 |
Alcoholic drinks/year over age 25 (per 100 drinks) | 170 | - | 1.09 (0.96 - 1.23) | 0.156 | Â | Â | Â |
Smoking Status | Â | Â | Â | Â | Â | Â | Â |
   Not Current Smoker | 144 | 23 | 1.00 | 0.217 |  |  |  |
   Current Smoker | 26 | 35 | 1.78 (0.73 - 4.37) |  |  |  |  |
Education | Â | Â | Â | Â | Â | Â | Â |
   Less than Bachelor's Degree | 57 | 39 | 1.00 | 0.003 | 57 | 1.00 | 0.002 |
   Bachelor's Degree or more | 113 | 18 | 0.34 (0.17 - 0.70) |  | 113 | 0.29 (0.14 -0.63) |  |
Sunbathing session ages 8-15 (per 50 sessions) | 170 | - | 1.09 (0.99 - 1.21) | 0.087 | Â | Â | Â |
Sunbathing session ages 16-25 (per 50 sessions) | 170 | - | 1.10 (1.01 - 1.20) | 0.033 | 170 | 1.10 (1.00 -1.21) | 0.044 |
Sunbathing session ages 26+ (per 50 sessions) | 169 | - | 1.09 (0.99 - 1.20) | 0.086 | Â | Â | Â |
Age at skin biopsy | 170 | - | 0.93 (0.80 - 1.08) | 0.344 | Â | Â | Â |