Seventy-eight percent of patients in the buprenorphine group ( @ of @ -LSB- @ % CI , @ % -@ % -RSB- ) vs @ % in the referral group ( @ of @ -LSB- @ % CI , @ % -@ % -RSB- ) and @ % in the brief intervention group ( @ of @ -LSB- @ % CI , @ % -@ % -RSB- ) were engaged in addiction treatment on the @th day after randomization ( P < @ ) .