Number of P. falciparum malaria attacks by treatment period and age according to three definitions of malaria attacks: A. Fever or fever-related symptoms plus parasitemia higher than the period specific threshold level.

B. Fever or fever-related symptoms plus parasitemia higher than the baseline threshold. C. Fever or fever-related symptoms plus any level of parasitemia. Values in bracket with definition B indicate the proportion of underdiagnosed malaria attacks compared to definition A. Values in bracket with definition C indicate the proportion of overdiagnosed malaria attacks compared to definition A. Dielmo, October 1990–December 2010.