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The prevalence of personality disorders in 210 women with eating disorders.

BACKGROUND
The purpose of this study was to assess the prevalence, reliability, and predictive value of comorbid personality disorders in a large sample of 210 women seeking treatment for anorexia nervosa (N = 31), bulimia nervosa (N = 91), or mixed disorder (N = 88).


METHOD
All subjects were interviewed using the Structured Interview for DSM-III Personality Disorders as part of a longitudinal outcome study of eating disorders currently underway at Massachusetts General Hospital.


RESULTS
Of the 210 subjects, 27% had at least one personality disorder; the most commonly observed was borderline personality disorder in 18 subjects (9%). The highest prevalence of personality disorders was found in the anorexia nervosa/bulimia nervosa group at 39%, followed by 22% in the anorexics and 21% in the bulimic sample. We found statistically significant differences regarding the distribution of personality disorders across eating disorder groups. The dramatic personality disorder cluster was differentially distributed across groups; this finding was accounted for by higher rates of borderline personality disorder in the bulimia nervosa and anorexia nervosa/bulimia nervosa groups than in the anorexia nervosa group. The anxious personality disorder cluster was differentially distributed across groups with higher rates in the anorexia nervosa and anorexia nervosa/bulimia nervosa samples. Those subjects with a comorbid personality disorder had a significantly slower recovery rate than those without a comorbid personality disorder.


CONCLUSION
The prevalence of personality disorders is not high in treatment-seeking women with eating disorders compared with previously studied samples. The greatest frequency of comorbid personality disorders is in the anorexia nervosa/bulimia nervosa group; this subset also had longer duration of eating disorder illness and much greater comorbid Axis I psychopathology compared with the rest of the sample. Future studies should address whether personality disorders have predictive value in the long-term course and outcome of eating disorders.