Fig. 2

Risk factor analysis for PCR positivity of participants enrolled at (a) Schistosoma mansoni (n = 981) and (b) S. haematobium (n = 464) endemic study sites. Positivity rates, univariable and multivariable logistic regression with effect estimates in terms of crude and adjusted ORs and 95% CI. Variables that were controlled for in the multivariable regression, included: study site (when applicable), sex, age groups, education level, ever treated with praziquantel, working as a farmer and being main contributor to the family income. CI confidence interval, n sample size, OR odds ratio, PCR polymerase chain reaction, Pos. positivity frequencies, % Pos. positivity percentages