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American Journal of Epidemiology Vol. 146, No. 7: 592-595
Copyright © 1997 by The Johns Hopkins University School of Hygiene and Public Health

research-article

A Note on the Grouping of Surveillance Data When Adjusting for Reporting Delays

Matthew G. Law and John M. Kaldor

Reprint requests to Matthew G. Law, National Centre In HIV Epidemiology and Clinical Research, The University of New South Wales, 376 Victoria Street, Dariinghurst, Sydney, NSW 2010, Australia

Analyses that adjust disease incidence data for reporting delays are often based on grouped data. A way of grouping data based on the quarter in which a case is reported, using all cases reported by a given cutoff date, is compared with the usual method of categorization based on a time-delay between diagnosis and reporting. The two methods of tabulation are illustrated using cases of the acquired immunodeficiency syndrome (AIDS) diagnosed and reported in Australia. A simple simulation study confirms that estimates of adjusted quarterly AIDS counts based on the quarter of report grouping are less variable than those based on the time-delay grouping.

acquired immunodeficiency syndrome; epidemiologic methods; incidence reporting


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