title: 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.
abstract: 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.
authors.affiliation: Institute for Social and Behavioral Research, Iowa State University, Ames 50010, USA. rlspoth@iastate.edu
authors.forename: R
authors.initials: R
authors.lastname: Spoth
authors.forename: M
authors.initials: M
authors.lastname: Lopez Reyes
authors.forename: C
authors.initials: C
authors.lastname: Redmond
authors.forename: C
authors.initials: C
authors.lastname: Shin
mesh_terms: D000293:Adolescent; D016497:Adolescent Health Services / Q000592:standards*; D017668:Age of Onset; D016009:Chi-Square Distribution; D002648:Child; D018450:Disease Progression; D005192:Family Health; D005260:Female; D006801:Humans; D016013:Likelihood Functions; D008137:Longitudinal Studies; D008297:Male; D015146:Midwestern United States; D015397:Program Evaluation; D011634:Public Health / Q000379:methods*; D012044:Regression Analysis; D019035:Rural Health Services / Q000592:standards; D012572:School Health Services / Q000592:standards*; D019966:Substance-Related Disorders / Q000517:prevention & control*