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Volume 8, Number 6—June 2002


Clinical Epidemiology of Malaria in the Highlands of Western Kenya

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

Main Article

Table 2

Deseasonalized child admissions at the three study hospitals, Kenyaa

Site Data span Constant Slope Change t value Significance Adjusted r2
Kilgoris 1980–1999 (n=20) 56.2 7.2 144 6.956 p<0.001 0.165
Kisii 1987–2000 (n=14) 433.8 10.0 140 2.362 p=0.019 0.027
Tabaka 1981–2000 (n=20) 166.4 7.6 152 6.980 p<0.001 0.174

a The data span shows the range of complete years for which data are available (parenthesis indicate the number of observation years). The adjusted r2 (sometimes called the coefficient of determination) is goodness-of-fit measure of a linear regression model and varies between 0 and 1. The measure is the proportion of variation in the dependent variable (in this case, malaria admissions) explained by the regression model (in this case, the trend line). The t value is the value of a t-test used to determine if the adjusted r2 value is significantly different from 0. The result is shown in the significance column where p values <0.05 are significant.

Main Article