Volume 21, Number 2—February 2015
Refining Historical Limits Method to Improve Disease Cluster Detection, New York City, New York, USA
|Case status||Included in HLMoriginal||Included in HLMrefined|
|“Not a case”||No||Yes|
|Seroconversion 1 y||No||Yes|
*HLM, historical limits method; HLMoriginal, method as originally applied in New York City before May 20, 2013; HLMrefined, refined method applied starting May 20, 2013.
†Pending is a transient status that in the normal course of case investigations can be assigned to a case in the current period but not in the baseline period.
1Current affiliation: RTI International, Research Triangle Park, North Carolina, USA.
2Current affiliation: Colorado Department of Public Health and Environment, Denver, Colorado, USA.