Table 1.
Age-standardized baseline characteristics of study participants according to history of rosacea in the Nurses’ Health Study II, 1991
| Characteristics a | Rosacea | |
|---|---|---|
| No | Yes | |
| No. of participants | 89,163 | 1,086 |
| Age, mean (SD), y b | 36.1 (4.7) | 37.6 (4.1) |
| Family history of melanoma, % | 4.4 | 5.2 |
| Current smoker, % | 11.9 | 9.2 |
| Past smoker, % | 22.7 | 26.5 |
| Pack years, for ever smokers | 11.8 (8.6) | 10.4 (7.8) |
| Alcohol intake, mean (SD), g/d | 3.2 (6.1) | 2.9 (5.3) |
| Body mass index, mean (SD), kg/m2 | 24.6 (5.3) | 25.0 (5.9) |
| Physical activity, metabolic equivalent hours per week (SD) | 20.7 (26.5) | 18.8 (22.5) |
| Annual erythemal UV exposure at residence, mean (SD), mW/m2 | 185.6 (23.6) | 184.4 (23.3) |
| Hair color, % | ||
| Light brown | 30.4 | 33.5 |
| Dark brown/black | 39.9 | 36.7 |
| Blonde | 16.5 | 18.6 |
| Red | 3.9 | 4.2 |
| Missing | 9.3 | 7.0 |
| Skin reaction to sun, % | ||
| Burn reaction to the sun | 24.1 | 25.3 |
| Blistering burn reaction to the sun | 24.0 | 30.2 |
| Number of severe or blistering sunburns from ages 15–20, % | ||
| None | 32.8 | 30.3 |
| 1 – 2 | 39.7 | 35.5 |
| 3 – 4 | 17.2 | 19.8 |
| 5 + | 10.0 | 13.6 |
| Missing | 0.3 | 0.8 |
| Number of moles on the legs (>3 mm), % | ||
| None | 45.7 | 43.2 |
| 1 – 2 | 18.8 | 18.5 |
| 3 – 4 | 10.2 | 10.9 |
| 5 + | 21.8 | 24.1 |
| Missing | 3.5 | 3.3 |
| Physical exam, % | 89.6 | 93.1 |
| Use of sunscreen during the past summer ** , % | ||
| 0% to 50% of time | 31.8 | 27.7 |
| 75% of time | 28.2 | 30.3 |
| 100% of time | 20.6 | 26.7 |
| Missing | 19.4 | 15.3 |
**
Value is from 1993
a
Data are presented as means (SD) or medians (Q25, Q75) for continuous variables, by percentage for categorical variables, and are standardized to the age distribution of the study population, unless otherwise indicated.
b
Values are not age adjusted.