Table 3.
Mediated Effect of Parent- and Peer-Level Variables on Violence Trajectories
| Mediator | Indirect Effecta,b | z | SE | Percent Mediated | |
|---|---|---|---|---|---|
| Parental involvement | Alcohol use | .199 | 13.01*** | .01 | 10.2 |
| Marijuana use | .201 | 64.02*** | .003 | 10.2 | |
| Other drug use | .141 | 8.21*** | .02 | 7.2 | |
| Intention to attend college | .798 | 10.93*** | .007 | 4.1 | |
| Desire to leave home | .217 | 15.98*** | .01 | 11.0 | |
| Group fighting | .233 | 11.36*** | .02 | 11.9 | |
| Baseline violence | .010 | 9.25*** | .03 | 0.5 | |
| Total | 55.11 | ||||
| Peer alcohol use | Alcohol use | .301 | 8.57*** | .04 | 16.2 |
| Marijuana use | .291 | 7.41*** | .04 | 15.7 | |
| Other drug use | .209 | 5.41*** | .04 | 11.3 | |
| Intention to attend college | .036 | 7.95*** | .005 | 1.9 | |
| Desire to leave home | .20 | 9.60*** | .02 | 1.1 | |
| Group fighting | .266 | 7.36*** | .04 | 14.3 | |
| Baseline violence | .290 | 7.28*** | .04 | 15.6 | |
| Total | 76.1 | ||||
| Peer marijuana use | Alcohol use | .054 | 7.89*** | .03 | 3.1 |
| Marijuana use | .321 | 8.03*** | .04 | 18.3 | |
| Other drug use | .208 | 8.44*** | .02 | 11.9 | |
| Intention to attend college | .032 | 7.89*** | .004 | 1.8 | |
| Desire to leave home | .194 | 10.60*** | .02 | 11.0 | |
| Group fighting | .248 | 7.77*** | .03 | 14.1 | |
| Baseline violence | .271 | 6.96*** | .04 | 15.5 | |
| Total | 75.6 |
Note. All models are adjusted for demographic variables.
a
These mediated effects were generated in accordance with MacKinnon (2008) and Komro, Perry, Williams, Stigler, Farbakhsh, and Veblen-Mortenson (2001). The percent mediation was generated using the formula: [(a × b/(a × b + c); MacKinnon, 2008].
b
Indirect effects are not directly comparable across variables. Percentage mediation is comparable across variables and groups of variables.
***
p < .001.