Table 2. Comparison of cases and controls in the Skin Health Study.
| Cases | Controls | Crude Odds Ratio | ||||
|---|---|---|---|---|---|---|
| Characteristic | N | (%) | N | (%) | (95% CI) | |
| Age (years) | ||||||
| 25-29 | 76 | (6.5) | 68 | (6.2) | 1.03 | (0.72, 1.46) |
| 30-39 | 198 | (17.0) | 193 | (17.5) | 0.94 | (0.75, 1.20) |
| 40-49 | 407 | (34.9) | 393 | (35.7) | 0.95 | (0.79, 1.15) |
| 50-59 | 486 | (41.6) | 447 | (40.6) | 1.00 | |
| Gender | ||||||
| Male | 468 | (40.1) | 445 | (40.4) | 0.99 | (0.83, 1.17) |
| Female | 699 | (59.9) | 656 | (59.6) | 1.00 | |
| Income | ||||||
| < $60,000 | 348 | (29.8) | 373 | (33.9) | 0.82 | (0.69, 0.98) |
| $60,000 + | 798 | (68.4) | 703 | (63.9) | 1.00 | |
| Missing | 21 | (1.8) | 25 | (2.2) | ||
| Completed college | ||||||
| No | 612 | (52.4) | 610 | (55.4) | 0.88 | (0.75, 1.04) |
| Yes | 555 | (47.6) | 489 | (44.4) | 1.00 | |
| Missing | 0 | (0.0) | 2 | (0.2) | ||
| Eye color | ||||||
| Grey/blue | 529 | (45.3) | 445 | (40.4) | 1.46 | (1.18, 1.82) |
| Green | 175 | (15.0) | 142 | (12.9) | 1.52 | (1.14, 2.01) |
| Hazel | 237 | (20.3) | 236 | (21.4) | 1.24 | (0.96, 1.59) |
| Brown | 226 | (19.4) | 278 | (25.3) | 1.00 | |
| Natural hair color | ||||||
| Red | 120 | (10.3) | 46 | (4.2) | 3.53 | (2.43, 5.12) |
| Blond | 362 | (31.0) | 226 | (20.5) | 2.17 | (1.73, 2.72) |
| Light brown | 396 | (33.9) | 438 | (39.8) | 1.22 | (1.00, 1.50) |
| Dark brown/black | 289 | (24.8) | 391 | (35.5) | 1.00 | |
| Skin color (inside upper arm) | ||||||
| Very fair | 215 | (18.4) | 128 | (11.6) | 5.50 | (2.70, 11.18) |
| Fair | 827 | (70.9) | 746 | (67.8) | 3.63 | (1.83, 7.18) |
| Light olive | 114 | (9.8) | 191 | (17.4) | 1.95 | (0.96, 3.99) |
| Dark olive, brown, black | 11 | (0.9) | 36 | (3.2) | 1.00 | |
| Moles | ||||||
| Many | 71 | (6.1) | 12 | (1.1) | 13.81 | (7.32, 26.05) |
| Some | 250 | (21.4) | 92 | (8.4) | 6.35 | (4.73, 8.51) |
| Few | 644 | (55.2) | 545 | (49.5) | 2.76 | (2.25, 3.39) |
| None | 191 | (16.4) | 446 | (40.5) | 1.00 | |
| Missing | 11 | (0.9) | 6 | (0.5) | ||
| Freckles | ||||||
| Many | 18 | (1.6) | 11 | (1.0) | 1.90 | (0.89, 4.06) |
| Some | 75 | (6.4) | 44 | (4.0) | 1.98 | (1.34, 2.92) |
| Few | 196 | (16.8) | 127 | (11.5) | 1.79 | (1.39, 2.30) |
| Very few | 326 | (27.9) | 278 | (25.3) | 1.36 | (1.12, 1.66) |
| None | 547 | (46.9) | 635 | (57.7) | 1.0 | |
| Missing | 5 | (0.4) | 6 | (0.5) | ||
| Family history of melanoma | ||||||
| Yes | 216 | (18.5) | 224 | (20.3) | 0.87 | (0.71, 1.08) |
| No | 939 | (80.5) | 850 | (77.2) | 1.00 | |
| Missing | 12 | (1.0) | 27 | (2.5) | ||
| Lifetime routine sun exposure, hours | ||||||
| High | 372 | (31.9) | 382 | (34.7) | 0.85 | (0.70, 1.05) |
| Medium | 390 | (33.4) | 365 | (33.1) | 0.94 | (0.77, 1.15) |
| Low | 399 | (34.2) | 350 | (31.8) | 1.00 | |
| Missing | 6 | (0.5) | 4 | (0.4) | ||
| Lifetime sun exposure from outdoor activities, hours | ||||||
| High | 388 | (33.2) | 367 | (33.3) | 0.95 | (0.78, 1.16) |
| Medium | 378 | (32.4) | 377 | (34.2) | 0.90 | (0.74, 1.10) |
| Low | 397 | (34.0) | 357 | (32.5) | 1.00 | |
| Missing | 4 | (0.4) | 0 | (0.0) | ||
| Lifetime sun exposure from outdoor jobs, hours | ||||||
| High | 210 | (18.0) | 232 | (21.1) | 0.84 | (0.68, 1.04) |
| Low | 262 | (22.5) | 225 | (20.4) | 1.08 | (0.88, 1.33) |
| None | 689 | (59.0) | 640 | (58.1) | 1.00 | |
| Missing | 6 | (0.5) | 4 | (0.4) | ||
| Mean lifetime sunscreen use | ||||||
| High | 405 | (34.7) | 351 | (31.9) | 1.31 | (1.07, 1.61) |
| Medium | 409 | (35.0) | 349 | (31.7) | 1.34 | (1.09, 1.63) |
| Low | 352 | (30.2) | 401 | (36.4) | 1.00 | |
| Missing | 1 | (0.1) | 0 | (0.0) | ||
| Lifetime number of burns from sun (lasting more than one day) | ||||||
| >5 | 739 | (63.3) | 595 | (54.0) | 2.56 | (1.67, 3.93) |
| 3-5 | 224 | (19.2) | 215 | (19.5) | 2.15 | (1.36, 3.39) |
| 1-2 | 168 | (14.4) | 221 | (20.0) | 1.57 | (0.99, 2.49) |
| None | 33 | (2.8) | 68 | (6.3) | 1.00 | |
| Missing | 3 | (0.3) | 2 | (0.2) | ||