Figure 4.

Variation in prevalence of protozoan infections by region of origin of subjects. For numbers of subject in each region see Table 1, and the statistical analysis of the individual components of the final model is given in the text. A. G. duodenalis. For the goodness of fit of the minimum sufficient model see legend to Fig. 3B. B. Non-pathogenic amoebae. For the goodness of fit of the minimum sufficient model see legend to Fig. 3C. C. Pathogenic amoebae. For the goodness of fit of the minimum sufficient model, the likelihood ratio χ²₈₄₂ = 411.7 (P = 1).