Table I.
Selected characteristics of NHS II study participants in 1989 by severe teenage acne status.
| Severe teenage acne |
||
|---|---|---|
| No (n = 81 666) | Yes (n = 6957) | |
| Agea, year | 34.0 (4.7) | 34.0 (4.5) |
| Age at menarchea, year | 12.4 (1.4) | 12.3 (1.5) |
| Menstrual cycle length at ages 18–22, day | 30.3 (6.1) | 30.8 (6.7) |
| BMI, kg/m² | 24.0 (5.0) | 24.0 (4.9) |
| BMI at age 18, kg/m² | 21.3 (3.3) | 21.2 (3.2) |
| Height, m | 1.65 (0.07) | 1.65 (0.07) |
| Drink 7+/week at teenage, % | 1.7 | 1.9 |
| Alcohol consumption at ages 15–17, g/day | 1.2 (3.9) | 1.2 (4.2) |
| Current smokers, % | 13.1 | 11.8 |
| Infertility, % | 15.6 | 16.7 |
| Nulliparity, % | 30.3 | 35.0 |
| Ibuprofen user, % | 18.3 | 24.7 |
| Isotretinoin use, % | 1.4 | 16.6 |
| Tetracycline use, % | 2.4 | 35.2 |
| Current oral contraceptive user, % | 14.1 | 14.0 |
| White, % | 93.2 | 93.6 |
| More than five sunburns, % | 9.4 | 10.8 |
| Painful or blistering burn at childhood, % | 23.0 | 26.4 |
| Red hair, % | 3.9 | 3.3 |
Values are means (SD) or percentages that are standardized to the age distribution of the study population.
aNot age adjusted.