Statistical modelling

Human infections

We can see from the parameter estimates that both adolescents (Age 2: P<0.001)) and adults (Age 3: P<0.05)) are more frequently infected than children. Likewise females (Gender 2) are significantly less infected than males (P<0.05).

By using the Predict command in the dialog box we can obtain mean value estimates for the three age groups, and by clicking Predict again obtain means for males and females. We can conclude, therefore, that the rate of infection in adolescents and adults in sites 2 − 5 is approaching twice that in children and that males were slightly more frequently infected than females, maybe because males spend more time working or playing in the river. The overall average monthly detected percentage infection rate was, however, very low.

As shown earlier, schistosomiasis prevalence was higher in the overall population in the dry than the wet season. However, data by age group and gender are no longer available to allow the data to be separated in this way.