By spring of @th grade , students in CTC communities were more likely than students in control communities to have abstained from any drug use ( adjusted risk ratio -LSB- ARR -RSB- = @ ; @ % CI , @-@ @ ) , drinking alcohol ( ARR = @ ; @ % CI , @-@ @ ) , smoking cigarettes ( ARR = @ ; @ % CI , @-@ @ ) , and engaging in delinquency ( ARR = @ ; @ % CI , @-@ @ ) .