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Table 2: 
West Haven criteria for semiquantitative grading of HE
GradeCriteria
1Trivial lack of awareness, euphoria or anxiety, shortened attention span, impaired performance of addition (Sixty-seven percent of patients with cirrhosis may have minimal HE.)
2Lethargy or apathy, minimal disorientation for time or place, subtle personality change, inappropriate behavior, impaired performance of subtraction
3Somnolence to semistupor, but responsive to verbal stimuli; confusion; gross disorientation
4Coma (unresponsive to verbal or noxious stimuli)