Anemia risk was reduced ( RR : 0.53 ; 95 % CI : 0.43 , 0.66 ) , as were risks of ID ( RR : 0.74 ; 95 % CI : 0.69 , 0.79 by SF ; RR : 0.65 ; 95 % CI : 0.59 , 0.71 by BI ) and IDA ( RR : 0.49 ; 95 % CI : 0.38 , 0.62 by SF ; RR : 0.51 ; 95 % CI : 0.40 , 0.65 by BI ) .