4.
不同性别早产儿生后24 h内的PLT及PCT比较 （x±s）
| 性别 | 例数 | PLT (×109/L) | PCT (%) |
| 注：[PLT]血小板计数；[PCT]血小板压积。 | |||
| 男 | 612 | 232±72 | 0.24±0.07 |
| 女 | 458 | 236±73 | 0.25±0.08 |
| t值 | 0.902 | 1.217 | |
| P值 | 0.367 | 0.224 | |
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