Table 1. Distribution of selected known risk factors between melanoma cases and healthy controls.
| Variables | Controls, (n = 500) | Cases, (n = 500) | OR (95% CI) |
|---|---|---|---|
| N (%) | N (%) | ||
| Age (y) | |||
| ≤60 | 262 (52.4) | 247 (49.3) | |
| >60 | 238 (47.6) | 253 (50.7) | |
| Sex | |||
| Male | 238 (47.5) | 238 (47.5) | |
| Female | 262 (52.5) | 262 (52.5) | |
| Hair color | |||
| Black or brown | 388 (77.6) | 320 (64.0) | 1.00 |
| Blond or red | 112 (22.4) | 180 (36.0) | 2.05 (1.54–2.73) |
| Eye color | |||
| Not blue | 330 (66.0) | 278 (53.7) | 1.00 |
| Blue | 170 (34.0) | 222 (44.3) | 1.55 (1.19–2.02) |
| Skin color | |||
| Dark brown | 278 (55.5) | 202 (40.5) | 1.00 |
| Fair | 222 (44.5) | 298 (59.5) | 1.85 (1.43–2.39) |
| Tanning ability after prolonged sun exposure | |||
| Average or deep | 366 (73.1) | 290 (58.0) | 1.00 |
| Light or none | 134 (26.9) | 210 (42.0) | 1.98 (1.50–2.60) |
| Lifetime sunburns with blistering | |||
| 0 | 213 (42.6) | 158 (31.5) | 1.00 |
| ≥1 | 287 (57.4) | 342 (68.5) | 1.61 (1.23–2.10) |
| Freckling in the sun as a child | |||
| No | 305 (60.9) | 256 (51.1) | 1.00 |
| Yes | 195 (39.1) | 244 (48.9) | 1.49 (1.15–1.93) |
| Family history of cancer | |||
| No | 407 (81.4) | 369 (73.7) | 1.00 |
| Yes | 93 (18.6) | 131 (26.3) | 1.55 (1.14–2.13) |