Corticosteroid-free remission at week 16 was achieved by 39.7 % ( 31 of 78 ) of patients receiving infliximab/azathioprine , compared with 22.1 % ( 17 of 77 ) receiving infliximab alone ( P = .017 ) and 23.7 % ( 18 of 76 ) receiving azathioprine alone ( P = .032 ) .