ET含量与疾病严重程度呈正相关。
ET level was positively correlated with the severity of CVD.
结合临床资料，对临床症状和体征进行疾病严重程度评分。
A severity index of clinical symptoms and signs was used to grade illness severity.
疾病严重程度的指标选自明确的或可能的心梗病例的住院记录。
Severity indicators were chosen from abstracted hospital charts validated as a definite or probable MI.
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