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| Asthma (%) | Non-asthma(%) | χ2 | P | OR | 95%CI | |
| CNV | 47 (10.17) | 415 (89.83) | 5.171 | 0.023* | 1.721 | (1.073,2.759) |
| Non-CNV | 31 (6.18) | 471 (93.82) |
Patients with a history of asthma that developed CNV compared with controls in our epidemiological study.
