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| Group | n | History of asthma in the first and second-grade relatives | History of other allergies in the first and second-grade relatives |
|---|---|---|---|
| Urban area | 551 | 150 (27.2) | 207 (37.6) |
| Suburban area | 150 | 42 (28.0) | 24 (16.0) |
| Rural area | 142 | 60 (42.3) | 54 (38.0) |
| χ2 value | 12.48 | 25.87 | |
| P value | <0.01 | <0.01 |
