Table 1.
Demographics of US Population and Study Participants
| Demographic | 2015 Projected US Population (N=321M) | All Participants (N=45,016) | AA Participants (N=511) |
|---|---|---|---|
| Age | |||
| 11–12 | 3.0% | 1334 (3.0%) | 2 (0.4%) |
| 13–17 | 7.4% | 3330 (7.4%) | 9 (1.8%) |
| 18–24 | 11.3% | 5083 (11.3%) | 47 (9.2%) |
| 25–34 | 16.0% | 7186 (16.0%) | 131 (25.6%) |
| 35–44 | 14.7% | 6612 (14.7%) | 124 (24.3%) |
| 45–54 | 15.6% | 7036 (15.6%) | 96 (18.8%) |
| 55–64 | 14.8% | 6657 (14.8%) | 63 (12.3%) |
| 65+ | 17.3% | 7778 (17.3%) | 39 (7.6%) |
| Age, years | |||
| Mean (SD) | – | 43.0 (19.03) | 41.2 (14.12) |
| Median | – | 43.0 | 39.0 |
| Min-Max | – | 11–97 | 12–78 |
| Gender | |||
| Male | 49.2% | 22,145 (49.2%) | 299 (58.5%) |
| Female | 50.8% | 22,871 (50.8%) | 212 (41.5%) |
| Race | |||
| White | 77.1% | 34,715 (77.1%) | 313 (61.3%) |
| Black or African American | 13.3% | 5995 (13.3%) | 133 (26.0%) |
| Asian | 5.6% | 2519 (5.6%) | 45 (8.8%) |
| Native American or Alaskan | 1.2% | 526 (1.2%) | 8 (1.6%) |
| Pacific Islander | 0.2% | 90 (0.2%) | 2 (0.4%) |
| Other Race | 2.6% | 1171 (2.6%) | 10 (2.0%) |
| Hispanic, n (%) | 17.6% | 3043 (6.8%) | 60 (11.7%) |
| Geographic Region | |||
| Northeast | 17.5% | 8287 (18.4%) | 74 (14.5%) |
| Midwest | 21.1% | 9898 (22.0%) | 95 (18.6%) |
| West | 23.7% | 9330 (20.7%) | 119 (23.3%) |
| South | 37.7% | 17,501 (38.9%) | 223 (43.6%) |
| Household Income | |||
| $0–$14,999 | 11.6% | 4792 (10.6%) | 45 (8.8%) |
| $15,000–$24,999 | 10.5% | 4865 (10.8%) | 59 (11.5%) |
| $25,000–$34,999 | 10.0% | 4691 (10.4%) | 75 (14.7%) |
| $35,000–$49,999 | 12.7% | 5959 (13.2%) | 67 (13.1%) |
| $50,000–$74,999 | 16.7% | 7901 (17.6%) | 96 (18.8%) |
| $75,000–$99,999 | 12.1% | 5725 (12.7%) | 62 (12.1%) |
| $100,000–$149,999 | 14.1% | 6603 (14.7%) | 71 (13.9%) |
| $150,000–$199,999 | 6.2% | 2557 (5.7%) | 21 (4.1%) |
| $200,000 and over | 6.1% | 1923 (4.3%) | 15 (2.9%) |
Abbreviations: AA, alopecia areata; US, United States; SD, standard deviation.