The cumulative incidence of celiac disease among patients 3 years of age was 5.2 % ( 95 % confidence interval [ CI ] , 3.6 to 6.8 ) , with similar rates in the gluten group and the placebo group ( 5.9 % [ 95 % CI , 3.7 to 8.1 ] and 4.5 % [ 95 % CI , 2.5 to 6.5 ] , respectively ; hazard ratio in the gluten group , 1.23 ; 95 % CI , 0.79 to 1.91 ) .