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Comparison of aggravating factors of AR symptoms between patients from the 1990s and 2010s
| Number of patients (%) | P* | ||
|---|---|---|---|
| 1990s (n = 1447) | 2010s (n = 3388) | ||
| Cleaning | 111 (7.7) | 542 (16.0) | < 0.001 |
| Dust | 538 (37.2) | 1913 (56.5) | < 0.001 |
| Bedding | 58 (4.0) | 355 (10.5) | < 0.001 |
| Smoking | 192 (13.3) | 430 (12.7) | 0.606 |
| Cold air | 632 (43.7) | 1400 (41.3) | 0.135 |
| Air conditioner | 258 (17.8) | 961 (28.4) | < 0.001 |
* Chi square test
