目的：研究人均医疗费用与危重率的关系。
Objective: Investigate the relation between average medical charge and severity rate.
年人均医疗费1 5 6.8元，各组之间没有显著差异，但低收入组医疗费用占年人均收入比例较高；
The annual payment for health care was average 156.8 yuan per person and there is no difference among 5 groups, but the proportion of payment was higher at low income group.
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