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| Districts | % (n/N) |
| Northeast China | 1.96 (133/6,798) |
| South China | 1.72 (23/1,341) |
| East China | 1.70 (109/6,400) |
| Northwest China | 1.08 (24/2,213) |
| Central China | 1.03 (34/3,306) |
| Southwest China | 0.98 (49/4,985) |
| North China | 0.94 (90/9,566) |
