title: Impact of conjoint trajectories of body mass index and marijuana use on short sleep duration.
abstract: OBJECTIVE
  We examined the association between the conjoint developmental trajectories of body mass index (BMI) and marijuana use from age 24 to age 32 and short sleep duration.
  
  
  METHODS
  The participants included 158 African American male, 267 African American female, 166 Puerto Rican male, and 225 Puerto Rican female young adults (N=816). Using Mplus, we obtained the conjoint trajectories of BMI and marijuana use. Logistic regression analyses examined the association between the conjoint trajectories and short sleep duration.
  
  
  RESULTS
  Five conjoint trajectory groups were extracted: normal BMI and no or low marijuana use, obese and no or low marijuana use, morbidly obese and some marijuana use, normal BMI and high marijuana use, and obese and high marijuana use. Those in the obese and no or low marijuana use group, the morbidly obese and some marijuana use group, and the obese and high marijuana use group were more likely to report shorter sleep duration than those with normal BMI and no or low marijuana use group.
  
  
  CONCLUSIONS
  This study highlights the significance of examining joint trajectories over several developmental stages. In treating short sleep duration, we propose focusing on treating obesity, and also treating marijuana use if applicable.
authors.affiliation: Department of Psychiatry, New York University School of Medicine, New York, New York.
authors.forename: Judith S
authors.initials: JS
authors.lastname: Brook
authors.forename: Jung Yeon
authors.initials: JY
authors.lastname: Lee
authors.forename: Elinor B
authors.initials: EB
authors.lastname: Balka
authors.forename: David W
authors.initials: DW
authors.lastname: Brook
authors.forename: Stephen J
authors.initials: SJ
authors.lastname: Finch
mesh_terms: D000328:Adult; D000367:Age Factors; D015992:Body Mass Index; D005260:Female; D006801:Humans; D008297:Male; D008385:Marijuana Smoking / Q000503:physiopathology*; D009765:Obesity / Q000503:physiopathology*; D012890:Sleep / Q000502:physiology*; D013997:Time Factors; D055815:Young Adult