1.
不同年龄段患儿甲流并发神经系统症状发生率比较 [例（%）]
| 年龄 | 例数 | 并发神经系统症状 |
| 婴儿期(< 1岁) | 129 | 9(7.0) |
| 幼儿期(1岁~) | 294 | 126(42.9) |
| 学龄前期(3岁~) | 374 | 134(35.8) |
| 学龄期(7~14岁) | 98 | 22(22.4) |
| χ2值 | 59.07 | |
| P值 | < 0.001 |
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