title: A new approach to clustering eating disorder patients: assessing external validity and comparisons with DSM-IV diagnoses.
abstract: BACKGROUND
  This study assessed the external validity of four statistically distinct clusters identified in a sample of eating disorder patients, derived from eating disorder features, attachment and coping styles. It also compared clusters with DSM-IV diagnoses.
  
  
  METHODS
  Eating disorder psychopathology, attachment, coping, mood, health status and general functioning were measured in 165 patients.
  
  
  RESULTS
  The 'mild eating disorder group' reported significantly lower levels of functional impairment compared with the 'insecure generalised eating disorder' group, and significantly higher levels of social functioning, vitality and general mental health compared with the 'passive/avoidant restrictors' and 'insecure generalised eating disorder' groups. These latter groups reported significantly higher levels of depression compared with the 'bulimic' and 'mild eating disorder' groups. Compared with DSM-IV diagnoses, clusters were more clearly differentiated on a wide range of features, including mood and health status as well as eating disorder features, attachment and coping.
  
  
  CONCLUSIONS
  Findings provide preliminary support for the external validity of the clusters. Future research might extend this work by investigating the clusters in relation to recovery, relapse and treatment response.
authors.affiliation: Mental Health Group, Clinical Neurosciences Division, University of Southampton, United Kingdom. hannahturner0@gmail.co
authors.forename: Hannah
authors.initials: H
authors.lastname: Turner
authors.forename: Rachel
authors.initials: R
authors.lastname: Bryant-Waugh
authors.forename: Robert
authors.initials: R
authors.lastname: Peveler
mesh_terms: D000223:Adaptation, Psychological; D000293:Adolescent; D000328:Adult; D000339:Affect; D000704:Analysis of Variance; D016000:Cluster Analysis; D039721:Diagnostic and Statistical Manual of Mental Disorders; D001068:Feeding and Eating Disorders / Q000145:classification* / Q000175:diagnosis*; D005260:Female; D006801:Humans; D008297:Male; D009769:Object Attachment; D010555:Personality Inventory; D015203:Reproducibility of Results; D012720:Severity of Illness Index; D011795:Surveys and Questionnaires