Volume 40 | Number 4 | August 2005

Abstract List

Terry L. Schell, Maria Orlando, Andrew R. Morral


To document the prospective, reciprocal relationships among substance use problems, utilization of drug treatment, and predisposing beliefs thought to increase treatment utilization.

Data Source

Persistent Effects of Treatment Study‐Adolescent (PETS‐A), conducted by the Center on Substance Abuse Treatment. This was a longitudinal study of youths originally participating in one of two CSAT studies; one sample included 476 youths receiving residential drug treatment, and the other included 519 youths receiving outpatient treatment.

Study Design

This study uses five waves of data collected over a 12‐month period to examine the temporal relationships among four variables: treatment dose, substance use problems, drug resistance self‐efficacy, and perceived need for treatment (PNT). Data from this longitudinal study were analyzed using cross‐lagged panel models, and structural equation modeling techniques were used to estimate the prospective, reciprocal relationships among these four variables in each of the two samples, while controlling for several covariates.

Principal Findings

Both PNT and low drug resistance self‐efficacy led to higher levels of subsequent treatment. However, low self‐efficacy presaged increases in drug problems while PNT predicted decreases.


Understanding the role of psychological variables in the utilization of health services is complicated for psychological disorders because beliefs that affect treatment can also influence the disorder itself. Efforts to keep adolescents in drug treatment should focus on convincing youth that treatment can help them with their problems, rather than convincing them that they cannot resist drugs on their own. While both messages increase treatment utilization, the latter belief undermines the effects of treatment.