Intellectual functioning of adolescent and adult patients with eating disorders

Christina M. T. Schilder*, Annemarie A. van Elburg, Wim M. Snellen, Lot C. Sternheim, Hans W. Hoek, Unna N. Danner

*Corresponding author for this work

    Research output: Contribution to journalArticleAcademicpeer-review

    7 Citations (Scopus)

    Abstract

    ObjectiveIntelligence is a known vulnerability marker in various psychiatric disorders. In eating disorders (ED) intelligence has not been studied thoroughly. Small-scale studies indicate that intelligence levels might be above general population norms, but larger scale studies are lacking. The aim of this study was to determine intellectual functioning in ED patients and associations with severity of the disorder. Methods: Wechsler's Full scale IQ (FSIQ), Verbal IQ (VIQ) and Performance IQ (PIQ) of 703 adolescent and adult ED patients were compared with population norms. Exploratory analyzes were performed on associations between IQ and both somatic severity (BMI and duration of the disorder) and psychological/behavioral severity (Eating Disorder Inventory [EDI-II] ratings) of the ED. Results: Mean IQ's were significantly higher than population means and effect-sizes were small-to-medium (d=.28, .16 and .23 for VIQ, PIQ, and FSIQ). No linear associations between IQ and BMI were found, but the most severely underweight adult anorexia nervosa (AN) patients (BMI 15) had higher VIQ (107.7) than the other adult AN patients (VIQ 102.1). In adult AN patients PIQ was associated with psychological/behavioral severity of the ED. Discussion: Our findings suggest that, in contrast with other severe mental disorders where low intelligence is a risk factor, higher than average intelligence might increase the vulnerability to develop an ED. (c) 2016 Wiley Periodicals, Inc.(Int J Eat Disord 2017; 50:481-489)

    Original languageEnglish
    Pages (from-to)481-489
    Number of pages9
    JournalInternational journal of eating disorders
    Volume50
    Issue number5
    DOIs
    Publication statusPublished - May-2017

    Keywords

    • IQ
    • intelligence
    • intellectual functioning
    • eating disorders
    • anorexia nervosa
    • bulimia nervosa
    • vulnerability marker
    • ANOREXIA-NERVOSA
    • BULIMIA-NERVOSA
    • CENTRAL COHERENCE
    • PREMORBID IQ
    • SCHIZOPHRENIA
    • CHILDREN
    • RISK
    • INTELLIGENCE
    • ENDOPHENOTYPE
    • DEPRESSION

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