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| Group | n | History of eczema | History of allergic rhinitis | History of urticaria | History of drug allergy |
|---|---|---|---|---|---|
| Urban area | 551 | 253 (45.9)a | 286 (51.9)b | 134 (24.3)a | 97 (17.6)a |
| Suburban area | 150 | 38 (25.3) | 74 (49.3) | 22 (14.7) | 16 (10.7) |
| Rural area | 142 | 21 (14.8) | 52 (36.6) | 11 (7.7) | 14 (9.9) |
| χ2 value | 57.59 | 10.57 | 22.69 | 8.05 | |
| P value | <0.05 | <0.05 | <0.05 | <0.05 |
a, P<0.05, compared with the suburban and rural areas; b, P<0.05, compared with the rural area.
