Fig. 3

S. haematobium (a) and S. mansoni (b) infection according to WASH status. There was no significant association between school prevalence of S. haematobium (a) or S. mansoni (b) and overall WASH status at schools. Analyses were performed on the school-level mean for attending children only as the WASH parameters were specifically collected for attending school-age children. S. haematobium infection = ≥1 Schistosoma haematobium egg(s) identified by urine filtration; S. mansoni infection = ≥1 S. mansoni egg(s) identified by duplicate Kato-Katz slides; Any STH infection = ≥1 Ascaris lumbricoides, Trichuris trichiura and/or hookworm egg(s) identified by duplicate Kato-Katz slides; WASH status = total score of observed and reported access to an improved water source; functional, clean and adequate number of latrines; hand washing stations with soap; and hygiene teaching at the school - a minimum score of 0 indicated that no factors were present and a maximum score of 12 that all factors were present. The central line indicates best fit of the correlation between the 2 variables, and the 2 curved lines indicate the 95 % confidence interval of the best fit line