Mean adjusted number of days using the main drug at 6 months was 12 for no brief intervention vs 11 for the BNI group ( incidence rate ratio [ IRR ] , 0.97 ; 95 % CI , 0.77-1 .22 ) and 12 for the MOTIV group ( IRR , 1.05 ; 95 % CI , 0.84-1 .32 ; P = .81 for both comparisons vs no brief intervention ) .