Table 4.
Allergic and autoimmune diseases in patients with urticaria n (%).
| Comorbidities | Urticaria patients (N = 3255) | General population (N = 37,786) | P value |
| Eczema | 774 (23.78) | 5119 (13.55) | <0.01 |
| Asthma | 80 (2.46) | 435 (1.15) | <0.01 |
| Allergic conjunctivitis | 90 (2.76) | 300 (0.79) | <0.01 |
| Allergic rhinitis | 631 (19.39) | 3592 (9.51) | <0.01 |
| Food allergy | 473 (14.53) | 1682 (4.45) | <0.01 |
| Drug allergy | 378 (11.61) | 1953 (5.17) | <0.01 |
| H.pylori infection | 84 (2.58) | 437 (1.16) | <0.01 |
| Thyroid disease | 104 (3.20) | 537 (1.42) | <0.01 |
| Alopecia areata | 15 (0.46) | 164 (0.43) | 0.824 |
| Connective tissue disease∗ | 34 (1.04) | 279 (0.74) | 0.054 |
∗
Connective tissue diseases include systemic lupus erythematosus, rheumatoid arthritis, dermatomyositis, systemic scleroderma and Sjögren's syndrome, etc.