IPTm reduced the incidence of malaria by 96 % ( 95 % confidence interval [ CI ] , 88 % -99 % , P < .0001 ) , the prevalence of asymptomatic parasitemia by 94 % ( 95 % CI , 92 % -96 % , P < .0001 ) , and the prevalence of anemia by 40 % ( 95 % CI , 19 % -56 % , P < .0001 ) .