Association Rules and Data Mining in Hospital Infection Control and Public Health Surveillance

Table 4

Sample Location-specific Events (Experiment C)

Event			Findings	Action Indicated
EmptySet	→	LocNICU SourceSP	An increase from 0.5% (2/409) in S1 to 2% (12/555) in S2 in the probability that a Pa isolate is from the NICU and is isolated from sputum.	Review the intensive care procedures in the NICU and/or antimicrobial usage.
SourceSP	→	LocNICU	An increase from 4% (2/54) in S1 to 23% (12/53) in S2 in the probability that a Pa isolate is from a patient in the NICU given that the isolate is from sputum.	Supports the above recommendation.

Note: Data were for one year (1996) and were analyzed for six-month intervals. S1 indicates Jan-June; S2, Jul-Dec. Pa indicates Pseudomonas aeruginosa.

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