3.
两组患儿上机后的血气变化情况[P50（P25，P75）]
| 项目 | 例数 | ΔpH | ΔOI | ΔPaCO2 (mm Hg) |
| 鼻塞式CPAP组 | 61 | 0.11(0.04, 0.20) | 78.0(28.8, 110.5) | -1.0(-8.5, 3.0) |
| 气泡式CPAP组 | 69 | 0.14(0.04, 0.23) | 65.0(33.0, 110.0) | -4.0(-12.8, 1.5) |
| Z值 | -1.481 | -0.182 | -2.076 | |
| P值 | 0.139 | 0.856 | 0.038 |
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