Table 4.
Relative reduction rates (RRR) for age 25 and 27 dichotomous variables by intervention condition: Full sample and higher risk subsample
| SFP 10–14 + LST
|
LST
|
|||
|---|---|---|---|---|
| Variable | RRR (%)
|
RRR (%)
|
||
| Age 25 | Age 27 | Age 25 | Age 27 | |
| Drunkenness | ||||
| Full Sample | 9.4 | 13.8 | 9.6 | 9.2 |
| Higher Risk | 18.8 | 17.4 | 12.6 | 12.2 |
| Alcohol Problems | ||||
| Full Sample | 9.2 | 6.1 | 2.5 | 5.9 |
| Higher Risk | 12.2 | 8.8 | 3.9 | 8.3 |
| Cigarette Usea | ||||
| Full Sample | 22.0 | 14.9 | 28.3 | 25.3 |
| Higher Risk | 25.8 | 16.7 | 36.2 | 29.5 |
| Illicit Drug Use | ||||
| Full Sample | 7.6 | 12.7 | 6.3 | 9.8 |
| Higher Risk | 11.5 | 16.3 | 9.1 | 12.9 |
| Marijuana Use | ||||
| Full Sample | 10.6 | 12.0 | 11.1 | 11.7 |
| Higher Risk | 14.1 | 15.9 | 14.2 | 14.9 |
| Lifetime Illicit Drug Use | ||||
| Full Sample | 10.7 | 12.5 | 11.5 | 9.8 |
| Higher Risk | 14.2 | 16.2 | 14.6 | 12.9 |
| Lifetime Prescription Drug Misuse | ||||
| Full Sample | 8.8 | 9.8 | 13.1 | 13.6 |
| Higher Risk | 13.0 | 13.9 | 16.3 | 16.8 |
Note. SFP 10–14 = Strengthening Families Program: For Parents and Youth 10–14; LST = Life Skills Training; RRR = relative reduction rate calculated from the model-based estimates (RRR = control rate – intervention rate/control rate). Variables were dichotomized (0 and 1) so that a score of 1 indicated: drunkenness at greater than once per month; alcohol-related problems at one or more out of 10; cigarette use at greater than no use during the past year; illicit substance use (past year) at greater than no use; marijuana index (a sum of dichotomous measures of lifetime use, past year use, and past month use) at greater than no use; lifetime other illicit (a sum of dichotomous measures of five substances – cocaine, methamphetamine, ecstasy, GHB, and LSD or other hallucinogens) at greater than no use; lifetime prescription drug misuse (a sum of dichotomous measures of misuse of narcotics, amphetamines, barbiturates, and tranquilizers) at greater than no misuse. The lifetime use variables were corrected for consistency, so that once an individual indicated initiation of a substance, that initiation was also indicated at all later waves.
The best fitting models included direct effects from the intervention condition, risk, and the Intervention Condition X Risk interaction.