The incidence of acute diarrhea with zinc amino acid chelate ( 0.15 per 1,000 child-days ) was lower than with placebo ( 0.49 per 1,000 child-days ) ( RR = 0.32 , 95 % CI 0.006 to 3.990 , p = 0.346 ) and with zinc sulfate ( 0.78 per 1,000 child-days ) ( RR = 0.20 , 95 % CI : 0.0043 to 1.662 , p = 0.361 ) .