RESULTS	The unadjusted hazard ratio for positivity for one or more autoantibodies in the casein hydrolysate group , as compared with the control group , was 0.54 ( 95 % confidence interval [ CI ] , 0.29 to 0.95 ) , and the hazard ratio adjusted for an observed difference in the duration of exposure to the study formula was 0.51 ( 95 % CI , 0.28 to 0.91 ) .\