Compared with six ( 9 % ) of 67 participants treated as usual , 35 ( 45 % ) of 78 participants in the fixed value contingency management group met the primary outcome measure ( odds ratio 121 , 95 % CI 37-399 ; p < 00001 ) , as did 32 ( 49 % ) of 65 participants in the escalating value contingency management group ( 140 , 42-462 ; p < 00001 ) .