title: An investigation of the joint longitudinal trajectories of low body weight, binge eating, and purging in women with anorexia nervosa and bulimia nervosa.
abstract: OBJECTIVE
  To describe the longitudinal course of three core eating disorder symptoms-low body weight, binge eating, and purging-in women with anorexia nervosa (AN) and bulimia nervosa (BN) using a novel statistical approach.
  
  
  METHODS
  Treatment-seeking women with AN (n = 136) or BN (n = 110) completed the Eating Disorders Longitudinal Interval Follow-Up Evaluation interview every 6 months, yielding weekly eating disorder symptom data for a 5-year period. Semiparametric mixture modeling was used to identify longitudinal trajectories for the three core symptoms.
  
  
  RESULTS
  Four individual trajectories were identified for each eating disorder symptom. The number and general shape of the individual trajectories was similar across symptoms, with each model including trajectories depicting stable absence and stable presence of symptoms as well as one or more trajectories depicting the declining presence of symptoms. Unique trajectories were found for low body weight (fluctuating presence) and purging (increasing presence). Conjunction analyses yielded the following joint trajectories: low body weight and binge eating, low body weight and purging, and binge eating and purging.
  
  
  CONCLUSIONS
  The course of individual eating disorder symptoms among patients with AN and BN is highly variable. Future research identifying clinical predictors of trajectory membership may inform treatment and nosological research.
authors.affiliation: Department of Psychology, University at Albany, State University of New York, Albany, New York, USA.
authors.forename: Jason M
authors.initials: JM
authors.lastname: Lavender
authors.forename: Kyle P
authors.initials: KP
authors.lastname: De Young
authors.forename: Debra L
authors.initials: DL
authors.lastname: Franko
authors.forename: Kamryn T
authors.initials: KT
authors.lastname: Eddy
authors.forename: Andrea E
authors.initials: AE
authors.lastname: Kass
authors.forename: Meredith S
authors.initials: MS
authors.lastname: Sears
authors.forename: David B
authors.initials: DB
authors.lastname: Herzog
mesh_terms: D000856:Anorexia Nervosa / Q000523:psychology*; D001835:Body Weight; D002032:Bulimia / Q000523:psychology*; D052018:Bulimia Nervosa / Q000523:psychology*; D005247:Feeding Behavior / Q000523:psychology; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D013851:Thinness / Q000523:psychology*; D055815:Young Adult
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