3.
两组大便次数比较 （x±s，次/d）
| 组别 | n | 入院时 | 治疗第3天 | 治疗第5天 |
| 对照组 | 44 | 7.7±1.6 | 5.2±1.1 | 4.1±1.0 |
| 研究组 | 44 | 7.7±1.6 | 3.3±1.0 | 2.8±1.0 |
| t值 | 0.175 | 8.316 | 6.405 | |
| P值 | 0.862 | < 0.001 | < 0.001 |
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