title: A Typology of Substance Use Among Pregnant Teens in the United States.
abstract: OBJECTIVE
  Previous research suggests that, in general, youth who become pregnant during their teenage years tend to report elevated levels of substance use prior to conception and substantial reductions in use during pregnancy. While such studies provide insight into aggregate patterns of adolescent substance use in relation to pregnancy, they may have the unintended effect of masking the behavioral heterogeneity of pregnant teens.
  
  
  METHODS
  The present study employs data from a large, population-based study of adolescents in the United States. We employ latent class analysis to identify subgroups of pregnant adolescents (ages 12-17; n = 810) on the basis of variables measuring the past 12-month and past 30-day use of an extensive array of substances.
  
  
  RESULTS
  Results revealed a four class solution. Classes were identified as Class 1: Abstainers (n = 344, 42.47 %), Class 2: Drinkers (n = 303, 37.41 %), Class 3: Alcohol and Cannabis Users (n = 77, 9.51 %), and Class 4: Polydrug Users (n = 86, 10.62 %). The Abstainers class had the highest proportion of Hispanic youth (34.3 %) as well as the highest proportion of youth residing in households earning less than $20,000 per year (44.2 %). The Polydrug Users class had the highest proportion of youth who were in late adolescence (75.58 %), non-Hispanic white (54.65 %), high-income (13.95 %), and in their first trimester of pregnancy (58.33 %).
  
  
  CONCLUSIONS
  Findings point to an important degree of heterogeneity among pregnant teens and may have implications for the development of interventions designed for youth exhibiting disconcerting patterns of substance use prior to pregnancy.
authors.affiliation: School of Social Work, University of Texas at Austin, 1925 San Jacinto Blvd D3500, Austin, TX, 78712-0358, USA. salaswright@utexas.edu.
authors.forename: Christopher P
authors.initials: CP
authors.lastname: Salas-Wright
authors.affiliation: School of Social Work, College for Public Health and Social Justice, Saint Louis University, St. Louis, MO, USA.
authors.forename: Michael G
authors.initials: MG
authors.lastname: Vaughn
authors.affiliation: School of Social Work, University of Texas at Austin, 1925 San Jacinto Blvd D3500, Austin, TX, 78712-0358, USA.
authors.forename: Jenny
authors.initials: J
authors.lastname: Ugalde
mesh_terms: D000293:Adolescent; D000428:Alcohol Drinking / Q000208:ethnology; D000437:Alcoholism; D002648:Child; D005260:Female; D006630:Hispanic or Latino / Q000706:statistics & numerical data*; D006801:Humans; D007182:Income; D008297:Male; D011159:Population Surveillance; D011247:Pregnancy; D011261:Pregnancy Trimester, First; D011253:Pregnancy in Adolescence / Q000208:ethnology*; D012959:Socioeconomic Factors; D019966:Substance-Related Disorders / Q000208:ethnology*; D011795:Surveys and Questionnaires; D014481:United States / Q000453:epidemiology; D044465:White People / Q000706:statistics & numerical data*
keywords: Adolescents; Alcohol; Neonatal health; Pregnancy; Substance use disorders