What was done
The authors examined trends in admission records from a hospital in western Kenya over the period 1965-1997 for patients that were admitted with a primary diagnosis of malaria.  These data were then compared with trends in temperature and precipitation over the 38-year period to ascertain their influence on malaria rates.

What was learned
A total of 10,169 admissions to the hospital with a primary diagnosis of malaria were recorded over the 38-year period of study.  Admissions were relatively low between 1965 and 1989, but "rose significantly" during the 1990s.  Mortality rates as a function of persons admitted were also higher in the 1990s as opposed to the 1960s, at 6.0% vs. 1.3%, respectively.  However, analyses of climate variables revealed no link between malaria admissions and climate, as there were no significant trends in average monthly temperature or mean monthly rainfall over the period of study.

What it means
Contrary to the claims of climate alarmists, who routinely equate increases in malaria incidence with global warming, this examination of real-world data shows climate to have little to do with the disease, at least in western Kenya, where this study was conducted.  Instead, the recent historical rise in malaria was attributed by the authors to increased disease resistance to the drug, chloroquine, that was used to treat it.