Eight years post-randomization , individuals randomized to ILI had better SPPBexp scores [ adjusted mean ( SE ) difference : 0.055 ( 0.022 ) , P = 0.01 ] and faster 20-m and 400-m walk speeds [ 0.032 ( 0.012 ) m s ( -1 ) , P = 0.01 , and 0.025 ( 0.011 ) m s ( -1 ) , P = 0.02 , respectively ] compared to those randomized to DSE .