5.
各组早产儿成熟SWC比例比较 [例（%）]
| 组别 | 例数 | 干预第1天 | 干预第7天 | 干预第14天 |
| 小胎龄对照组 | 23 | 0(0) | 8(35) | 9(39) |
| 小胎龄干预组 | 24 | 0(0) | 10(42) | 17(71) |
| χ2值 | - | 0.236 | 4.776 | |
| P值 | - | 0.627 | 0.029 | |
| 大胎龄对照组 | 22 | 6(27) | 10(45) | 15(68) |
| 大胎龄干预组 | 23 | 5(22) | 16(70) | 18(78) |
| χ2值 | 0.186 | 2.102 | 0.584 | |
| P值 | 0.666 | 0.147 | 0.445 |
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