Volume 21, Number 2—February 2015
Refining Historical Limits Method to Improve Disease Cluster Detection, New York City, New York, USA
||≥3 Cases required for signal: No. signals produced by HLMoriginal
||No. signals produced by HLMoriginal†
||No. signals produced by HLMrefined†
*HLM, historical limits method; HLMoriginal, method as originally applied in NYC prior to May 20, 2013; HLMrefined, refined method applied starting May 20, 2013; UHF, United Hospital Fund.
†At neighborhood level, reviewer could require >3 cases for signal.
1Current affiliation: RTI International, Research Triangle Park, North Carolina, USA.
2Current affiliation: Colorado Department of Public Health and Environment, Denver, Colorado, USA.