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Table 4 Description of the 6 major clusters identified for the UK encephalitis data using hierarchical clustering.

From: Cluster analysis for identifying sub-groups and selecting potential discriminatory variables in human encephalitis

Cluster

Major Characteristics

Other

Cluster 1

(n = 61)

Abnormal WCC, lethargy, headache,

fever

Abnormal protein, gastro-intestinal

symptoms, personality and behavioural

change, animal contact

Cluster 2

(n = 50)

Abnormal protein, WCC, personality and

behavioural change, fever

Animal contact

Cluster 3

(n = 44)

Personality and behavioural change,

fever,

Abnormal MRI, abnormal EEG, abnormal

protein, abnormal WCC, lethargy, headache,

gastro-intestinal animal contact

Cluster 4

(n = 21)

Lethargy, Seizure, fever, animal contact

Abnormal MRI, abnormal EEG, abnormal

WCC, irritability, personality and

behavioural change, recent infection

Cluster 5

(n = 15)

Abnormal EEG, abnormal WCC, seizure,

headache, sick person contact

Fever

Cluster 6

(n = 13)

Abnormal MRI, headache

Abnormal CT, abnormal protein, abnormal

WCC, lethargy, personality and behavioural

change, focal neurological abnormality,

other neurological symptoms