Assessing a public health approach to delay onset and progression of adolescent substance use: latent transition and log-linear analyses of longitudinal family preventive intervention outcomes

J Consult Clin Psychol. 1999 Oct;67(5):619-30. doi: 10.1037//0022-006x.67.5.619.


This study examined the effects of the Iowa Strengthening Families Program (ISFP) and the Preparing for the Drug-Free Years program (PDFY) on young adolescent transitions from nonuse of substances to initiation and progression of substance use. Analyses incorporated 3 waves of data collected over a 2.5-year period from 329 rural young adolescents. Outcomes were analyzed by using log-linear models that incorporated substance use status frequencies derived from latent transition analyses. Effects on delayed substance use initiation were shown for both the ISFP and the PDFY at a 2-year follow-up. Also at this follow-up, the PDFY showed effects on delayed progression of use among those previously reporting initiation.

Publication types

  • Clinical Trial
  • Randomized Controlled Trial
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Adolescent
  • Adolescent Health Services / standards*
  • Age of Onset
  • Chi-Square Distribution
  • Child
  • Disease Progression
  • Family Health*
  • Female
  • Humans
  • Likelihood Functions
  • Longitudinal Studies
  • Male
  • Midwestern United States
  • Program Evaluation
  • Public Health / methods*
  • Regression Analysis
  • Rural Health Services / standards
  • School Health Services / standards*
  • Substance-Related Disorders / prevention & control*