题目选项分析

Lists of hospitals have been compiled showing which hospitals have patient death rates exceeding the national average. The data have been adjusted to allow for differences in the ages of patients.

Each of the following, if true, provides a good logical ground for hospitals to object to interpreting rank on these lists as one of the indices of the quality of hospital care EXCEPT:

【选项】Some hospitals serve a larger proportion of low-income patients, who tend to be more seriously ill when admitted to a hospital