| 出生体重(g) | 例数 | ROP | 非ROP | 发生率(%) |
| <1000 | 24 | 13 | 11 | 54.16 |
| 1000~1500 | 71 | 23 | 48 | 32.39 |
| 1501~2000 | 130 | 26 | 104 | 20.00 |
| >2000 | 15 | 0 | 15 | 0.00 |
| χ2 |
|
|
| 20.591 |
| P |
|
|
| 0.000 |