《Table 3 Grading codes of chest pain degrees》

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《中医临床症状数据元提取探析（英文）》

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Classifications can be based on the characteristics of the symptom itself，for instance，the position，property and degree of the symptom in question.In this case，pain position，property and degree are taken as common data elements，and concrete position，property and degree as representations of the three data elements.From the three common data elements，we can extract“chest pain degree grading codes”，the name，definition，data type and representation format of which are presented in Table 2.The corresponding value of the data element is enumerable，with values from 1 to 4（Table 3）.