2.
不同胎龄早产儿GBS定植情况的比较 [例（%）]
| 胎龄分组 | 例数 | GBS定植 | |
| 阳性 | 阴性 | ||
| 注：[GBS] B族链球菌。 | |||
| < 34周 | 41 | 19(46) | 22(54) |
| 34 ~ < 37周 | 86 | 21(24) | 65(76) |
| χ2值 | 6.184 | ||
| P值 | 0.013 | ||
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