7.
不同年级学生焦虑和抑郁检出率比较 [n（%）]
| 组别 | 例数 | 社交焦虑 | 抑郁 |
| 四年级 | 259 | 55(21.2) | 27(10.4) |
| 五年级 | 332 | 114(34.3) | 33(9.9) |
| 六年级 | 328 | 93(28.4) | 43(13.1) |
| χ2值 | 12.26 | 1.89 | |
| P值 | 0.020 | 0.390 |
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