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两组早产儿一般资料比较
| 项目 | 非BPD组(n=51) | BPD组(n=35) | t/Z/χ2值 | P值 |
| 性别（男/女，例） | 28/23 | 20/15 | 0.042 | 0.837 |
| 胎龄(x ± s, 周） | 30.6±1.3 | 30.2±1.4 | 1.513 | 0.134 |
| 剖宫产[例(%)] | 31(61) | 18(51) | 0.741 | 0.389 |
| 出生体重(x ± s, g) | 1 235±168 | 1 215±156 | 0.547 | 0.586 |
| 1 min Apgar评分[M(P25, P75)，分] | 4(4, 5) | 4(3，5) | -0.893 | 0.372 |
| 5 min Apgar评分[M(P25, P75)，分] | 7(6, 7) | 6(5, 7) | -1.305 | 0.192 |
