Baseline demographic and disease characteristics of patients with AS and PsA. Values are n (%) unless otherwise specified.
| Characteristics | AS, n = 4288 | PsA, n = 10,832 |
|---|---|---|
| Age, yrs, mean (SD) | 49.1 (13.4) | 51.9 (11.8) |
| Age, yrs | ||
| 18–34 | 649 (15.1) | 822 (7.6) |
| 35–44 | 906 (21.1) | 1986 (18.3) |
| 45–54 | 1199 (28.0) | 3353 (31.0) |
| 55–64 | 1101 (25.7) | 3470 (32.0) |
| ≥ 65 | 433 (10.1) | 1201 (11.1) |
| Sex | ||
| Male | 2758 (64.3) | 5475 (50.5) |
| Female | 1530 (35.7) | 5357 (49.5) |
| US region | ||
| Northeast | 611 (14.2) | 1972 (18.2) |
| North Central | 947 (22.1) | 2673 (24.7) |
| South | 1443 (33.7) | 4053 (37.4) |
| West | 1245 (29.0) | 2009 (18.5) |
| Unknown | 42 (1.0) | 125 (1.2) |
| Health insurance | ||
| FFS | 3438 (80.2) | 8749 (80.8) |
| HMO and POS capitation | 693 (16.2) | 1658 (15.3) |
| Missing/unknown | 157 (3.7) | 425 (3.9) |
| ECI score, mean (SD) | 1.9 (1.6) | 1.2 (1.5) |
| ECI score | ||
| 0 | 495 (11.5) | 4397 (40.6) |
| 1 | 1698 (39.5) | 2997 (27.7) |
| 2 | 1034 (24.1) | 1809 (16.7) |
| 3 | 497 (11.6) | 828 (7.6) |
| 4+ | 564 (13.2) | 801 (7.4) |
| Comorbidities* | ||
| Type 2 diabetes | 528 (12.3) | 1773 (16.4) |
| Hypertension | 1263 (29.5) | 3534 (32.6) |
| Hyperlipidemia | 888 (20.7) | 2647 (24.4) |
| Ischemic heart disease | 281 (6.6) | 723 (6.7) |
| Any of the above | 1826 (42.6) | 5329 (49.2) |
↵* Identification was based on non-rule-out diagnoses. AS: ankylosing spondylitis; PsA: psoriatic arthritis; FFS: fee for service; HMO: health maintenance organization; POS: point of service; ECI: Elixhauser Comorbidity Index.