Table 2.
Median nevus density (nevi/m2), by body site, exposure pattern, and sex in children ages 7 to 8 y, Colorado (n = 743)
| Body area | % Total body surface area | Median (interquartile range) |
Sex difference, P* | |
|---|---|---|---|---|
| Girls (n = 384) | Boys (n = 355) | |||
| Total | 82.50 | 31.0 (20.4–46.2) | 36.0 (21.8–50.0) | 0.04 |
| Body site | ||||
| Face, neck | 8.00 | 43.7 (25.0–77.5) | 78.4 (46.6–122.6) | <0.0001 |
| Chest | 13.00 | 16.3 (7.9–28.1) | 21.7 (8.8–38.4) | <0.0001 |
| Back | 13.00 | 24.1 (8.6–39.0) | 30.6 (17.2–51.2) | <0.0001 |
| Upper arms, lateral | 3.50 | 58.2 (26.9–118.8) | 31.2 (0.0–84.3) | <0.0001 |
| Upper arms, medial | 4.00 | 27.2 (0.0–71.2) | 25.7 (0.0–49.8) | 0.005 |
| Forearms, lateral (and elbows) | 3.50 | 57.8 (25.9–117.1) | 60.3 (28.0–121.8) | 0.14 |
| Forearms, medial | 3.00 | 37.4 (0.0–98.9) | 36.7 (0.0–83.6) | 0.68 |
| Hands, dorsal | 3.00 | 33.1 (0.0–69.7) | 31.6 (0.0–65.6) | 0.39 |
| Thighs, anterior | 7.75 | 25.2 (0.0–43.8) | 13.3 (0.0–28.2) | <0.0001 |
| Thighs, posterior | 8.25 | 19.0 (9.8–37.0) | 11.0 (0.0–22.7) | <0.0001 |
| Lower legs, anterior (and knees) | 6.25 | 17.6 (0.0–49.6) | 17.4 (0.0–45.4) | 0.49 |
| Lower legs, posterior | 5.75 | 20.0 (0.0–52.3) | 19.8 (0.0–52.0) | 0.92 |
| Feet, anterior | 3.50 | 0.0 (0.0–26.7) | 0.0 (0.0–27.0) | 0.80 |
| Exposure pattern | ||||
| Chronically sun-exposed areas of the body† | Girls: 13.50 Boys: 14.50 |
52.2 (27.0–80.3) | 67.5 (43.4–107.8) | <0.0001 |
| Intermittently sun-exposed areas of the body‡ | Girls: 65.00 Boys: 64.00 |
25.3 (16.7–39.0) | 26.5 (15.0–38.9) | 0.76 |
*
By Mann-Whitney U test.
†
Face, lateral forearms, dorsal hands, anterior neck, and male posterior neck.
‡
Lateral upper arms, medial forearms, trunk, legs, dorsal feet, and female posterior neck.