Table 1 Age-standardized characteristics according to average annual frequency of indoor tanning bed usage during high school/college in US females (N = 81,746) a
Characteristics | None | 1–2 | 3–11 | ≥ 12 |
|---|---|---|---|---|
Number of participants | 74,331 | 3,400 | 2,788 | 1,227 |
Age, years | 34.8 (4.6) | 32.8 (5.0) | 32.2 (5.0) | 31.3 (4.8) |
Number of cigarettes per day ages 15–24 | 11.1 (7.6) | 10.9 (8.1) | 11.1 (8.4) | 12.1 (8.6) |
Usual number of alcoholic drinks ages 15–22b | 1.8 (2.9) | 2.1 (2.9) | 2.3 (3.2) | 2.5 (3.5) |
Frequency of strenuous physical activity/sports at least twice per week ages 14–22c | 4.7 (3.6) | 5.0 (3.6) | 5.1 (3.6) | 5.2 (3.6) |
Hair color, % | ||||
Red | 3.6 | 2.7 | 3.5 | 1.9 |
Blonde | 14.6 | 16.1 | 16.1 | 17.8 |
Dark brown | 35.7 | 34.1 | 36.2 | 32.8 |
Black | 3.1 | 1.2 | 1.3 | 0.8 |
Family history of melanoma, % | 4.2 | 4.8 | 6.5 | 5.0 |
History of major chronic diseases, %d | 12.3 | 12.7 | 10.9 | 10.6 |
Number of moles on lower legs, % | ||||
1–2 | 18.5 | 18.4 | 19.6 | 18.0 |
3–9 | 16.6 | 17.3 | 18.4 | 17.0 |
10+ | 14.1 | 16.9 | 15.2 | 19.7 |
The number of times per week spent outdoors in a swimsuit as a teenager, % | ||||
<1 | 14 | 7.9 | 6.6 | 5.6 |
1 | 9.5 | 8.3 | 7.3 | 4.8 |
2 | 16.0 | 14.9 | 14.0 | 10.6 |
Several | 45.1 | 50.9 | 51.7 | 53.9 |
Daily | 15.4 | 18.0 | 20.4 | 25.1 |
Percentage of time wearing sunscreen at the pool/beach as a teenager | ||||
100% | 1.4 | 0.9 | 0.7 | 1.5 |
75% | 4.1 | 3.7 | 3.1 | 3.1 |
50% | 9.9 | 9.7 | 9.4 | 7.9 |
25% | 22.4 | 26.2 | 23.7 | 20.5 |
0% | 62.2 | 59.5 | 63.1 | 67.0 |
Weekly hours spent outdoors in direct sunlight during the day during high school/college, % | ||||
<1 | 7.5 | 4.7 | 3.2 | 3.2 |
2–4 | 32.9 | 31.1 | 24.0 | 19.6 |
5+ | 59.6 | 64.2 | 72.8 | 77.2 |
Number of severe sunburns that blistered between ages 15–20, % | ||||
Never | 35.5 | 25.5 | 27.9 | 26.1 |
1–2 | 38.3 | 42.6 | 40.4 | 39.0 |
3–4 | 16.6 | 20.2 | 18.4 | 18.3 |
5–9 | 7.2 | 8.6 | 9.7 | 11.0 |
10+ | 2.4 | 3.1 | 3.6 | 5.6 |