3.
毛细支气管炎组与健康对照组血清IL-4及IFN-γ浓度比较 （x±s，ng/mL）
| 组别 | n | IL-4 | IFN-γ |
| 健康对照组 | 48 | 10±4 | 79±31 |
| 毛细支气管炎组 | 54 | 13±4 | 38±22 |
| t值 | 3.45 | -7.82 | |
| P值 | < 0.01 | < 0.01 |
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