2.
不同胎龄早产儿发生脑损伤的情况[n（%）]
| 胎龄(周) | 例数 | PVH-IVH | PVL |
| ＜28 | 89 | 38(42.70) | 4(4.49) |
| 28 ~ | 628 | 242(38.53) | 32(5.10) |
| 32 ~ | 788 | 196(24.87) | 23(2.92) |
| 34 ~＜37 | 1 882 | 322(17.11) | 29(1.54) |
| χ2值 | 140.531 | 25.375 | |
| P值 | ＜0.001 | ＜0.001 |
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