At day 91 , a total of 662 of 775 children ( 85.4 % ; 95 % confidence interval [ CI ] , 82.5 to 88.0 ) in the aerosol group , as compared with 743 of 785 children ( 94.6 % ; 95 % CI , 92.7 to 96.1 ) in the subcutaneous group , were seropositive , a difference of -9.2 percentage points ( 95 % CI , -12.2 to -6.3 ) .