胎龄(周) | 例数 | ROP | 非ROP | 发生率(%) |
<28 | 90 | 34 | 56 | 37.78 |
28~32 | 108 | 24 | 84 | 22.22 |
>32 | 42 | 4 | 38 | 9.52 |
χ2 |
|
|
| 13.268 |
P |
|
|
| 0.001 |