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Volume 8, Number 6—June 2002

Research

Defining and Detecting Malaria Epidemics in the Highlands of Western Kenya

Simon I. Hay*†Comments to Author , Milka Simba†, Millie Busolo‡, Abdisalan M. Noor†, Helen L. Guyatt*†, Sam A. Ochola‡, and Robert W. Snow*†‡
Author affiliations: *University of Oxford, Oxford, United Kingdom; †Kenya Medical Research Institute/Wellcome Trust Collaborative Programme, Nairobi, Kenya; ‡Ministry of Health, Nairobi, Kenya;

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Figure 4

Cumulative case graphs for child admissions in the three hospitals. Cumulative child admissions (<15 years) in Kilgoris (a), Kisii (b), and Tabaka (c). All years for which data were available are shown, 1980-1999, 1987-2000, and 1981-2000 time periods for Kilgoris, Kisii and Tabaka, respectively. Black dashed lines are all “normal” years. The blue line shows mean average cumulative child admissions over all years. Red lines show epidemic years, defined as the 2 years of highest total admissions. For Kilgoris these exceptional years are 1994 and 1998, for Kisii they are 1996 and 1997, and for Tabaka they are 1997 and 1996.

Figure 4. Cumulative case graphs for child admissions in the three hospitals. Cumulative child admissions (<15 years) in Kilgoris (a), Kisii (b), and Tabaka (c). All years for which data were available are shown, 1980-1999, 1987-2000, and 1981-2000 time periods for Kilgoris, Kisii and Tabaka, respectively. Black dashed lines are all “normal” years. The blue line shows mean average cumulative child admissions over all years. Red lines show epidemic years, defined as the 2 years of highest total admissions. For Kilgoris these exceptional years are 1994 and 1998, for Kisii they are 1996 and 1997, and for Tabaka they are 1997 and 1996.

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