Table 3. Overall and Subgroup Prevalence of Alopecia Totalis or Alopecia Universalis.
| Group | Alopecia totalis/universalis cases (either) | Total patients | Prevalence, % | Crude prevalence per 100 000 (95% CI) | Standardized prevalence per 100 000 (95% CI)a |
|---|---|---|---|---|---|
| Overall | 139 | 1 093 176 | 0.01 | 12.7 (10.6-14.8) | 11.6 (9.7-13.8) |
| Sex | |||||
| Female | 108 | 621 033 | 0.02 | 17.4 (14.1-20.7) | 16.4 (13.4-19.9) |
| Male | 31 | 472 143 | 0.01 | 6.6 (4.3-8.9) | 6.3 (4.2-9.0) |
| Age group, y | |||||
| 0-17 (pediatric) | 24 | 274 935 | 0.01 | 8.7 (5.2-12.2) | 8.8 (5.6-13.1) |
| ≥18 (adult) | 115 | 818 241 | 0.01 | 14.1 (11.5-16.6) | 12.9 (10.6-15.5) |
| 18-44 | 28 | 300 959 | 0.009 | 9.3 (5.9-12.7) | 8.7 (5.7-12.7) |
| 45-64 | 43 | 270 041 | 0.02 | 15.9 (11.2-20.7) | 14.6 (10.6-19.8) |
| ≥65 | 44 | 247 241 | 0.02 | 17.8 (12.5-23.1) | 16.4 (11.9-22.0) |
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.