Selected baseline characteristics of patients with Wilson disease (WD), overall and by subtype
| Hepatic*, n=1202 | Neurologic*, n=1206 | Psychiatric*, n=1003 | Overall, n=2115 | |
| Age at index date (years), mean (SD) | 40.4 (19.08) | 42.3 (20.70) | 39.2 (20.19) | 39.9 (20.06) |
| Male, N (%) | 607 (50.5%) | 659 (54.6%) | 558 (55.6%) | 1096 (51.8%) |
| US region of residence at index, N (%) | ||||
| Northeast | 254 (21.1%) | 246 (20.4%) | 182 (18.2%) | 462 (21.8%) |
| South | 376 (31.3%) | 398 (33.0%) | 332 (33.1%) | 647 (30.6%) |
| Midwest | 275 (22.9%) | 292 (24.2%) | 249 (24.8%) | 502 (23.7%) |
| West | 297 (24.7%) | 270 (22.4%) | 240 (23.9%) | 504 (23.8%) |
| Physician specialty of primary WD diagnosis, N (%)† | ||||
| Gastroenterology | 197 (16.4%) | 117 (9.7%) | 90 (9.0%) | 279 (13.2%) |
| General/family practice | 136 (11.3%) | 133 (11.0%) | 124 (12.4%) | 266 (12.6%) |
| Ophthalmology/optometry | 61 (5.1%) | 59 (4.9%) | 50 (5.0%) | 101 (4.8%) |
| Neurology | 41 (3.4%) | 75 (6.228%) | 48 (4.8%) | 88 (4.2%) |
| Follow-up period (years), mean (SD) | 2.2 (1.28) | 2.1 (1.25) | 2.1 (1.26) | 2.2 (1.27) |
| Never treated, N (%) | 962 (80.0%) | 1044 (86.6%) | 881 (87.8%) | 1755 (83.0%) |
*These groups are not mutually exclusive.
†This is the primary physician specialty for the first claim with WD as the primary diagnosis. Due to limitations in the analysis of the prevalent WD population, it cannot be inferred with certainty that it represents the first diagnosis.