The proportion of days with febrile illness between 6 and 18 mo was 4.9 % , and there were no differences between the groups : 4.9 % ( 95 % CI : 4.3 , 5.5 % ) , 4.5 % ( 95 % CI : 3.9 , 5.1 % ) , 4.7 % ( 95 % CI : 4.1 , 5.3 % ) , and 5.5 % ( 95 % CI : 4.7-6 .3 % ) in the milk-LNS , soy-LNS , CSB , and control groups , respectively .