Table 1.
Demographic characteristics at index date in the AA and matched non-AA cohorts
| Characteristic | AA cohort (n = 8784) | Non-AA cohort (n = 26,352) | AT/AU subtype (n = 599) | Non-AT/AU subtype (n = 8185) |
|---|---|---|---|---|
| AA subtype, n (%) | ||||
| AT/AU | 599 (6.8) | – | 599 (100) | – |
| Non-AT/AU | 8185 (93.2) | – | – | 8185 (100) |
| Age | ||||
| Mean (SD), y | 45.6 (17.9) | 45.6 (17.9) | 53.3 (18.8) | 45.0 (17.7) |
| Sex, n (%) | ||||
| Male | 3904 (44.4) | 11,712 (44.4) | 176 (29.4) | 3728 (45.5) |
| Female | 4880 (55.6) | 14,640 (55.6) | 423 (70.6) | 4457 (54.5) |
| Race/ethnicity, n (%) | ||||
| Asian | 900 (10.2) | 2700 (10.2) | 34 (5.7) | 866 (10.6) |
| Black | 894 (10.2) | 2682 (10.2) | 56 (9.3) | 838 (10.2) |
| Hispanic | 1787 (20.3) | 5361 (20.3) | 85 (14.2) | 1702 (20.8) |
| White | 5203 (59.2) | 15,609 (59.2) | 424 (70.8) | 4779 (58.4) |
| US region, n (%) | ||||
| Midwest | 1635 (18.6) | 5994 (22.7) | 116 (19.4) | 1519 (18.6) |
| Northeast | 1503 (17.1) | 2749 (10.4) | 83 (13.9) | 1420 (17.3) |
| South | 3668 (41.8) | 10,830 (41.1) | 280 (46.7) | 3388 (41.4) |
| West | 1947 (22.2) | 5913 (22.4) | 119 (19.9) | 1828 (22.3) |
| Unknown | 31 (0.4) | 866 (3.3) | 1 (0.2) | 30 (0.4) |
| Insurance type, n (%) | ||||
| Commercial | 7102 (80.9) | 20,836 (79.1) | 392 (65.4) | 6710 (82.0) |
| Medicare Advantage | 1685 (19.2) | 5497 (20.9) | 207 (34.6) | 1478 (18.1) |
AA alopecia areata, AT alopecia totalis, AU alopecia universalis