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Table 3 Classification of CTE according to the WHO

From: Health risks in international container and bulk cargo transport due to volatile toxic compounds

  Symptoms Cognitive defects Neurological abnormalities
Class I Fatigue, diminished memory, concentration and initiative No objective dysfunction No objective abnormalities
Organic affective syndrome Change in personality. Poor impulse control, lowered mood and motivation, irritability, anxiety, emotional lability
Class II Difficulties in concentration and attention, impairment of memory, decrease in learning capacity Objective evidence of cognitive impairment Minor neurological signs
Mild chronic toxic encephalopathy
Class III Marked global deterioration in intellect and memory Marked global deterioration in intellect and memory Neurological signs and/or neuroradiological abnormal findings
Severe chronic toxic encephalopathy