4.
不同出生体重早产儿的病死率 [例（%）]
| 出生体重分组 | 例数 | 病死率 |
| < 1 000 g | 151 | 89(58.94) |
| 1 000~1 499 g | 1 055 | 81(7.68) |
| 1 500~2 499 g | 1 733 | 80(4.62) |
| ≥2 500 g | 2 646 | 30(1.13) |
| χ2值 | 523.65 | |
| P值 | < 0.001 |
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