Both interventions significantly lowered incorrect prescribing of recommended antimalarials from 8 % ( 749/8 ,942 ) in the standard training arm to 2 % ( 250/10 ,118 ) in the HW arm ( adjusted RD ( aRD ) 4 % ; 95 % confidence interval ( CI ) 1 % to 6 % ; P = 0.008 ) and 2 % ( 184/10 ,163 ) in the HWP arm ( aRD 4 % ; 95 % CI 1 % to 6 % ; P = 0.005 ) .