Study Population.

aTwenty households sampled per village (except Pariang where 21 households were sampled in two villages).bProportion of households per village with each attribute calculated and the mean (SD) of village proportions obtained as the county level summary measure.cProtected source: handpump or well; unprotected: river, stream, pond or swamp.dMean (SD) of village proportions of households observed to have more than five flies in or around living areas or on children's faces, excluding around cattle.eSix missing values for age in males, three missing values for age in females, four missing values for sex; these 13 individuals were excluded from all analyses.