At 6 months , carriage of any S. aureus was 51.1 % in group 3 , 40.7 % in group 1 ( absolute risk reduction [ 95 % CI ] , 10.4 % [ 0.01 % -20.1 % ] ; P = .047 ) , and 42.8 % ( absolute risk reduction [ 95 % CI ] , 8.3 % [ -1.4 % to 18.0 % ] ; P = .099 ) in group 2 .