3.
不同出生体重早产儿发生脑损伤的情况[n（%）]
| 出生体重(g) | 例数 | PVH-IVH | PVL |
| ＜1 000 | 55 | 24(43.64) | 3(5.45) |
| 1 000 ~ | 359 | 143(39.83) | 21(5.85) |
| 1 500 ~ | 1 967 | 459(23.34) | 40(2.03) |
| ≥2 500 | 1 006 | 172(17.10) | 24(2.39) |
| χ2值 | 88.480 | 19.428 | |
| P值 | ＜0.001 | ＜0.001 |
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