4.
未合并鼻炎组与合并鼻炎组患儿FeNO及FnNO水平比较（x±s，ppb）
| 组别 | 例数 | FeNO | FnNO |
| 注：1 ppb=1×10-9mol/L。 | |||
| 未合并鼻炎组 | 55 | 22±11 | 477±209 |
| 合并鼻炎组 | 65 | 28±18 | 788±420 |
| t值 | 1.997 | 4.982 | |
| P值 | 0.010 | 0.001 | |
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