Mean number of symptoms and frequencies according to diagnosis
| Overall | Controls | Overall IMIDs | RA | IBD | SpA | Other IMIDs | Psoriasis | |
| Number of symptoms mean (SD) | 1.2 (1.7) | 1.3 (1.7) | 1.2 (1.6) | 1.0 (1.5) | 1.5 (1.7) | 1.1 (1.7) | 1.4 (1.7) | 1.2 (1.7) |
| Rhinitis n (%) | 618 (32.4) | 440 (38.2) | 178 (23.5) | 41 (18.1) | 55 (30.9) | 34 (23.9) | 23 (18.9) | 25 (28.1) |
| Headache n (%) | 476 (24.9) | 313 (27.2) | 163 (21.5) | 40 (17.7) | 49 (27.5) | 26 (18.3) | 26 (21.3) | 22 (24.7) |
| Pharyngitis n (%) | 422 (22.1) | 305 (26.5) | 117 (15.5) | 22 (9.7) | 33 (18.5) | 23 (16.2) | 27 (22.1) | 12 (13.5) |
| Cough n (%) | 330 (17.3) | 223 (19.4) | 107 (14.1) | 30 (13.3) | 22 (12.4) | 16 (11.3) | 21 (17.2) | 18 (20.2) |
| Fatigue n (%) | 285 (14.9) | 162 (14.1) | 123 (16.2) | 26 (11.5) | 44 (24.7) | 23 (16.2) | 21 (17.2) | 9 (10.1) |
| Diarrhoea n (%) | 216 (11.3) | 106 (9.2) | 110 (14.5) | 24 (10.6) | 54 (30.3) | 11 (7.7) | 9 (7.4) | 12 (13.5) |
| Musculoskeletal pain n (%) | 175 (9.2) | 87 (7.6) | 88 (11.6) | 37 (16.4) | 13 (7.3) | 18 (12.7) | 12 (9.8) | 8 (9.0) |
| Night sweats n (%) | 173 (9.1) | 90 (7.8) | 83 (11.0) | 20 (8.8) | 15 (8.4) | 17 (12.0) | 21 (17.2) | 10 (11.2) |
| Shortness of breath n (%) | 131 (6.9) | 68 (5.9) | 63 (8.3) | 14 (6.2) | 18 (10.1) | 11 (7.7) | 11 (9.0) | 9 (10.1) |
| Fever n (%) | 114 (6.0) | 73 (6.3) | 41 (5.4) | 6 (2.7) | 10 (5.6) | 8 (5.6) | 12 (9.8) | 5 (5.6) |
| Anosmia n (%) | 45 (2.4) | 26 (2.3) | 19 (2.5) | 4 (1.8) | 3 (1.7) | 3 (2.1) | 6 (4.9) | 3 (3.4) |
Data are presented as mean with SD or absolute number (n) with proportion (%).
IBD, inflammatory bowel disease; IMIDs, immune-mediated inflammatory diseases; RA, rheumatoid arthritis; SD, standard deviation; SpA, spondyloarthritis.