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Nine-year psychiatric trajectories and substance use outcomes: an application of the group-based modeling approach
Felicia W Chi1, Constance M Weisner
1Kaiser Permanente Northern California, Oakland, CA 94612-2403, USA. Felicia.W.Chi@kp.org
Abstract:
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.
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