Table 2.

Comparison of cases and controls in the Skin Health Study

CharacteristicCasesControlsCrude OR (95% CI)
n (%)n (%)
Age (y)
    25-2976 (6.5)68 (6.2)1.03 (0.72-1.46)
    30-39198 (17.0)193 (17.5)0.94 (0.75-1.20)
    40-49407 (34.9)393 (35.7)0.95 (0.79-1.15)
    50-59486 (41.6)447 (40.6)1.00
Gender
    Male468 (40.1)445 (40.4)0.99 (0.83-1.17)
    Female699 (59.9)656 (59.6)1.00
Income
    <$60,000348 (29.8)373 (33.9)0.82 (0.69-0.98)
    $60,000+798 (68.4)703 (63.9)1.00
    Missing21 (1.8)25 (2.2)
Completed college
    No612 (52.4)610 (55.4)0.88 (0.75-1.04)
    Yes555 (47.6)489 (44.4)1.00
    Missing0 (0.0)2 (0.2)
Eye color
    Gray/blue529 (45.3)445 (40.4)1.46 (1.18-1.82)
    Green175 (15.0)142 (12.9)1.52 (1.14-2.01)
    Hazel237 (20.3)236 (21.4)1.24 (0.96-1.59)
    Brown226 (19.4)278 (25.3)1.00
Natural hair color
    Red120 (10.3)46 (4.2)3.53 (2.43-5.12)
    Blonde362 (31.0)226 (20.5)2.17 (1.73-2.72)
    Light brown396 (33.9)438 (39.8)1.22 (1.00-1.50)
    Dark brown/black289 (24.8)391 (35.5)1.00
Skin color (inside upper arm)
    Very fair215 (18.4)128 (11.6)5.50 (2.70-11.18)
    Fair827 (70.9)746 (67.8)3.63 (1.83-7.18)
    Light olive114 (9.8)191 (17.4)1.95 (0.96-3.99)
    Dark olive, brown, black11 (0.9)36 (3.2)1.00
Moles
    Many71 (6.1)12 (1.1)13.81 (7.32-26.05)
    Some250 (21.4)92 (8.4)6.35 (4.73-8.51)
    Few644 (55.2)545 (49.5)2.76 (2.25-3.39)
    None191 (16.4)446 (40.5)1.00
    Missing11 (0.9)6 (0.5)
Freckles
    Many18 (1.6)11 (1.0)1.90 (0.89-4.06)
    Some75 (6.4)44 (4.0)1.98 (1.34-2.92)
    Few196 (16.8)127 (11.5)1.79 (1.39-2.30)
    Very few326 (27.9)278 (25.3)1.36 (1.12-1.66)
    None547 (46.9)635 (57.7)1.0
    Missing5 (0.4)6 (0.5)
Family history of melanoma
    Yes216 (18.5)224 (20.3)0.87 (0.71-1.08)
    No939 (80.5)850 (77.2)1.00
    Missing12 (1.0)27 (2.5)
Lifetime routine sun exposure (h)
    High372 (31.9)382 (34.7)0.85 (0.70-1.05)
    Medium390 (33.4)365 (33.1)0.94 (0.77-1.15)
    Low399 (34.2)350 (31.8)1.00
    Missing6 (0.5)4 (0.4)
Lifetime sun exposure from outdoor activities (h)
    High388 (33.2)367 (33.3)0.95 (0.78-1.16)
    Medium378 (32.4)377 (34.2)0.90 (0.74-1.10)
    Low397 (34.0)357 (32.5)1.00
    Missing4 (0.4)0 (0.0)
Lifetime sun exposure from outdoor jobs (h)
    High210 (18.0)232 (21.1)0.84 (0.68-1.04)
    Low262 (22.5)225 (20.4)1.08 (0.88-1.33)
    None689 (59.0)640 (58.1)1.00
    Missing6 (0.5)4 (0.4)
Mean lifetime sunscreen use
    High405 (34.7)351 (31.9)1.31 (1.07-1.61)
    Medium409 (35.0)349 (31.7)1.34 (1.09-1.63)
    Low352 (30.2)401 (36.4)1.00
    Missing1 (0.1)0 (0.0)
Lifetime number of burns from sun (lasting more than 1 d)
    >5739 (63.3)595 (54.0)2.56 (1.67-3.93)
    3-5224 (19.2)215 (19.5)2.15 (1.36-3.39)
    1-2168 (14.4)221 (20.0)1.57 (0.99-2.49)
    None33 (2.8)68 (6.3)1.00
    Missing3 (0.3)2 (0.2)