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Table 1 Lexical sets

From: Identifying influenza-like illness presentation from unstructured general practice clinical narrative using a text classifier rule-based expert system versus a clinical expert

Lexical set Description Expressions
Adult Flu Definitive Negative Expressions Expressions which relate specifically to other respiratory conditions in adults that are not ILI or that specifically negate ILI. 9
Adult Negative Flu Expressions Expressions which relate to signs or symptoms that when negated decrease likelihood of ILI. 9
Adult Positive Flu Expressions Expressions which relate specifically to signs or symptoms where present increase the likelihood of ILI. 9
Child Flu Definitive Negatives Expressions which related specifically to other respiratory conditions in children that are not ILI or expressions which are specific negation of ILI itself. 10
Child Negative Flu Expressions Expressions which relate to signs or symptoms in children that when negated decrease the likelihood of ILI. 25
Child Positive Flu Expressions Expressions which related to signs or symptoms in children that would increase the likelihood of ILI if present. 30
Definitive Negatives Expressions that relate to procedures associated with influenza, particularly prophylaxis but do not indicate ILI is currently present. 10
Negative Pyrexia Expressions Expression that when either negated, or when present suggest a temperature that is not elevated. 16
Negative Respiratory Expressions Expressions that relate to signs or symptoms that when negated decrease likelihood of respiratory disease. 28
Negative Symptom Expressions Expressions that when present suggest an elevated temperature. 10
Positive Pyrexia Expressions Expressions that related to signs or symptoms that may be associated with respiratory disease but not necessarily ILI. 11
Positive Respiratory Expressions Expressions that related to signs or symptoms that when present, increase the likelihood that ILI is present. 36
Positive Symptom Expressions Expressions which related to signs or symptoms that when present increase the likelihood of ILI. 10
ILI Prophylactic Expressions Expressions that relate to influenza and contribute to workload in general practice but where there is no active disease process present in an individual. These expressions include those that related to the seeking of prophylactic measures for influenza. 10