The CFM can be interpreted using quantitative voltage criteria as follows:
Normal: Upper margin of band of aEEG activity above 10 mV and lower margin of band of aEEG activity above 5 mV. EEG activity is continuous and variability with sleep/awake states may be present.
Moderately abnormal: Upper margin of band of aEEG activity above 10 mV. and lower margin below 5 mV. EEG may be discontinuous or show high amplitude bursts >25 mV.
Severely abnormal: Upper margin of band of aEEG activity below 10 mV. EEG is severely intermittent or low voltage. Bursts may be present often with voltage <10 mV.
Seizures (S) on the CFM are characterized by a sudden increase in voltage accompanied by narrowing of the band of CFM activity and followed by a brief period of suppression.
Note that if seizures are continuous or very frequent it may not be possible to classify the aEEG amplitude until the seizures have been treated.