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Evaluation Review
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Nine-Year Psychiatric Trajectories and Substance Use Outcomes

An Application of the Group-Based Modeling Approach

Felicia W. Chi

Kaiser Permanente Northern California, Felicia.W.Chi{at}kp.org

Constance M. Weisner

University of California, San Francisco Kaiser Permanente Northern California

This study identifies longitudinal psychiatric trajectories of 934 adult individuals entering chemical dependency treatment in a private, managed care health plan and examines the relationship of these trajectories with substance use (SU) outcomes. The authors apply a group-based modeling approach to identify trajectory groups based on repeated measures of psychiatric severity for 9 years and identify four distinct groups. Results of multivariate logistic generalized estimating equation models find an association between psychiatric trajectories and long-term SU. Older cohorts and life course measures of marital status and employment status as individuals changed over time are related to drug and some alcohol outcomes.

Key Words: longitudinal substance use outcomes • psychiatric trajectories • group-based modeling • managed care • adult chemical dependency patients

Evaluation Review, Vol. 32, No. 1, 39-58 (2008)
DOI: 10.1177/0193841X07307317
Add to CiteULike CiteULike   Add to Connotea Connotea   Add to Del.icio.us Del.icio.us   Add to Digg Digg   Add to Reddit Reddit   Add to Technorati Technorati    What's this?