The proportion of patients with a negative diagnostic test result for malaria prescribed an antimalarial decreased in arm B ( aRR = 0.96 ; 99 % CI : 0.84 , 1.10 ) and arm A ( aRR = 0.67 ; 99 % CI : 0.46 , 0.97 ) ; ( aRRR = 0.70 ; 99 % CI : 0.48 , 1.00 ) .