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The overall prevalence of AAB and the prevalence of AAB in each ethnicity.
| Ethnicity | Number of students | Number of students with AAB | Prevalence of AAB |
|---|---|---|---|
| Han | 175 | 2,382 | 7.35% |
| Tujia | 6 | 69 | 8.7% |
| Zhuang | 4 | 29 | 13.79% |
| Miao | 1 | 15 | 6.67% |
| Yi | 2 | 14 | 14.29% |
| Hui | 1 | 13 | 7.69% |
| others | 5 | 49 | 10.2% |
| Total | 194 | 2,571 | 7.5% |
