Fig. 1

Prevalence (%) and geometric mean intensity of infection by school (Kau and Ozi) and age group. Red bars = 5–9 years and blue bars = 10–12 years. Geometric mean intensity given in no. of eggs per 10 ml urine (Schistosoma haematobium) or per g faeces (Trichuris trichiura, hookworm, and Ascaris lumbricoides). Error bars indicate 95 % confidence interval. Note that all 10–12 years old children were infected with S. haematobium; hence no error bar