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早发型组和晚发型组患儿合并症比较 [n（%）]
| 组别 | 例数 | 肺炎 | 脑膜炎 | NEC | BPD | PVL | ROP | 胆汁淤积综合症 | 肺出血 |
| 注：[NEC]新生儿坏死性小肠结肠炎；[BPD]支气管肺发育不良；[PVL]脑室周围白质软化；[ROP]早产儿视网膜病变。 | |||||||||
| 早发型组 | 73 | 49(67.1) | 4(5.5) | 1(1.4) | 17(23.3) | 2(2.7) | 1(1.4) | 8(11.0) | 4(5.5) |
| 晚发型组 | 298 | 225(75.5) | 7(2.3) | 25(8.4) | 93(31.2) | 8(2.7) | 5(1.7) | 50(16.8) | 18(6.0) |
| χ2值 | 2.132 | 1.057 | 4.433 | 1.763 | 0.001 | 0.000 | 1.506 | 0.000 | |
| P值 | 0.144 | 0.304 | 0.035 | 0.184 | 0.979 | 1.000 | 0.220 | 1.000 | |
