Age-specific malaria parasite prevalence stratified by mean vector density ( An. gambiae and An. funestus combined) for each mosquito surveillance systems. For the left hand column (A, C, E), An. gambiae-mean catch is stratified as 0 or >0 and for the right hand column An. gambiae-mean catch is stratified using the upper and lower ranges being ≥ 0.25, versus ≤ 0.22 for CB-ITT (B), ≥4.00 versus ≤ 3.00 for QA-ITT (D) and ≥1.00 versus ≤0.50 for QA-HLC (F). The number at the top of each bar represents the total number individuals within particular age group from a set stratified surveyed clusters tested for malaria with RDT.