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The Journal of Health, Population and Nutrition
ISSN: 1606-0997
EISSN: 1606-0997
Vol. 25, No. 4, 2007, pp. 448-455
Bioline Code: hn07059
Full paper language: English
Document type: Research Article
Document available free of charge

The Journal of Health, Population and Nutrition, Vol. 25, No. 4, 2007, pp. 448-455

 en A Review of Changing Episode Definitions and Their Effects on Estimates of Diarrhoeal Morbidity
Wright, Jim; Gundry, Stephen W. & Conroy, Ronán M.


This paper describes how the methodology used for measuring diarrhoeal morbidity has changed over time and assesses how differences in episode definition have affected estimates of diarrhoeal morbidity among children aged less than five years. The episode definition used in 73 studies included in three previously-published literature reviews was identified. In earlier work, a method was developed that adjusts morbidity estimates to take account of differences in episode definition. This adjustment method was applied to the studies identified in these three literature reviews. Episode definitions were better documented and were more consistent in studies published after 1980. Adjusting morbidity estimates to account for definitional differences did not substantially alter the reviews’ conclusions. Diarrhoeal surveillance has steadily improved since 1980, with methodology becoming more consistent between studies and better documented. Although episode definitions have changed over time, the morbidity estimates derived in the three reviews appear robust to these changes.

Definition; Developing countries; Diarrhoea; Epidemiology; Morbidity

© Copyright 2007 - ICDDR,B: Centre for Health and Population Research
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