Study variables                                        Study subjects p-value PPF positive PPF negative Control Number examined 39 39 30   Mean Age 32.69 28.69 29.3  0.981 Sex M 76.2% 66.7% 65.4% 0.961 F 23.8% 33.3% 34.6 Mean egg excretion 278.6 141.7 - 0.424 Mean antioxidants 107.2 85.8 339.9 0.000 P-value 0.376 - - Positivity 61.5% 57.8% - 0.145

Table 2: Demographic and parasitological characteristics of 108, whose total antioxidant determined study participants from study sites endemic and non-endemic to S. mansoni , 2011.