Table 1 Characteristics of individuals with inflammatory arthritis (IA) and IA-free controls with incident depression or anxiety
| Â | Depression | Anxiety | ||
|---|---|---|---|---|
Characteristic | IA (n = 6,951) | IA-free Controls (n = 6,951) | IA (n = 3,701) | IA-free Controls (n = 3,701) |
Age, mean (SD) | 54.8 (18.3) | 54.8 (18.3) | 52.9 (16.8) | 52.9 (16.8) |
Female, n (%) | 4555 (65.5) | 4555 (65.5) | 2751 (74.3) | 2751 (74.3) |
Type of inflammatory arthritis, n (%) | Â | Â | Â | Â |
 Ankylosing spondylitis | 792 (11.4) | --- | 458 (12.4) | --- |
 Psoriatic arthritis | 521 (7.5) | --- | 326 (8.8) | --- |
 Rheumatoid arthritis | 5638 (81.1) | --- | 2917 (78.8) | --- |
Charlson-Romano comorbidity index, mean (SD) | 0.95 (1.09) | 0.37 (1.06) | 0.93 (1.04) | 0.32 (0.90) |
Neighbourhood income quintile, n (%) | Â | Â | Â | Â |
 Quintile 1 | 1585 (22.8) | 1495 (21.5) | 830 (22.4) | 786 (21.2) |
 Quintile 2 | 1454 (20.9) | 1377 (19.8) | 792 (21.4) | 718 (19.4) |
 Quintile 3 | 1363 (19.6) | 1337 (19.2) | 697 (18.8) | 736 (19.9) |
 Quintile 4 | 1349 (19.4) | 1327 (19.1) | 705 (19.1) | 761 (20.6) |
 Quintile 5 | 1200 (17.3) | 1415 (20.4) | 677 (18.3) | 700 (18.9) |
Residence, n (%) | Â | Â | Â | Â |
 Urban | 5870 (84.5) | 6101 (87.8) | 3076 (83.1) | 3201 (86.5) |
 Rural | 1081 (15.6) | 850 (12.2) | 625 (16.9) | 500 (13.5) |