这个词是什么意思？
The presence of co-existing or additional diseases with reference to an initial diagnosis or with reference to the index condition that is the subject of study. Comorbidity may affect the ability of affected individuals to function and also their survival; it may be used as a prognostic indicator for length of hospital stay, cost factors, and outcome or survival.
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D015897 · MeSH 2026。
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