Objective To establish the normal parameters of psychometric measures such as the number connection tests A ( NCT-A) and digit symbol tests ( DST) in assessment of minimal hepatic en-cephalopathy ( MHE). 目的建立诊断轻微肝性脑病(MHE)的有效数字连接试验(NCT)-A、数码符号试验(DST)等简易智能测试的正常范围。