Table 1. Overall and Demographic Subgroup Prevalence of Alopecia Areata.
| Group | Alopecia areata cases, all types | Total patients | Prevalence, % | Crude prevalence per 100 000 (95% CI) | Standardized prevalence per 100 000 (95% CI)a |
|---|---|---|---|---|---|
| Overall | 1812 | 1 093 176 | 0.17 | 166 (158-173) | 176 (168-185) |
| Sex | |||||
| Female | 1216 | 621 033 | 0.20 | 196 (185-207) | 198 (187-210) |
| Male | 596 | 472 143 | 0.13 | 126 (116-136) | 151 (138-164) |
| Age group, y | |||||
| 0-17 (pediatric) | 284 | 274 935 | 0.10 | 103 (91-115) | 104 (92-116) |
| 0-9 | 105 | 142 026 | 0.07 | 74 (60-88) | 75 (61-90) |
| 10-17 | 179 | 132 909 | 0.13 | 135 (115-154) | 135 (116-156) |
| ≥18 (adult) | 1528 | 818 241 | 0.19 | 187 (177-196) | 180 (171-189) |
| 18-29 | 237 | 145 833 | 0.16 | 163 (141-183) | 162 (142-185) |
| 30-39 | 293 | 103 009 | 0.28 | 284 (252-317) | 297 (263-335) |
| 40-49 | 301 | 108 465 | 0.28 | 278 (246-309) | 270 (240-303) |
| 50-59 | 251 | 137 260 | 0.18 | 183 (160-205) | 174 (153-197) |
| 60-69 | 246 | 150 446 | 0.16 | 164 (143-184) | 154 (136-175) |
| 70-79 | 162 | 110 082 | 0.15 | 147 (125-170) | 138 (117-160) |
| 80-89 | 38 | 63 146 | 0.06 | 60 (41-79) | 54 (38-74) |
| Race and ethnicityb | |||||
| Asian | 54 | 13 234 | 0.41 | 408 (299-517) | 414 (306-548) |
| Black | 269 | 120 032 | 0.22 | 224 (197-251) | 226 (199-255) |
| Hispanic/Latino | 20 | 9665 | 0.21 | 207 (116-298) | 212 (129-328) |
| White | 1009 | 619 464 | 0.16 | 163 (153-173) | 168 (157-179) |
| Other/multiracialc | 153 | 50 743 | 0.30 | 302 (254-349) | 314 (266-368) |
a
Overall prevalence is standardized by age and sex using the direct method and population estimates from the 2019 US Community Survey. Sex-specific prevalences are standardized by age. Age-specific prevalences are standardized by sex. Prevalences specific to race and ethnicity are standardized by age.
b
280 038 patients were missing race and ethnicity. Patients missing race and ethnicity were included in the estimates of AA prevalence for the overall group, and sex and age subgroups.
c
Comprised of Asian/Pacific Islander, Native American or Alaska Native, Native Hawaiian, multiracial, or other (not specified).