The frequency of AN in schizophrenia has been approximated
to be between 1 and 4% [11, 24]; the comorbidity
between these disorders seems to vary with sex, at 0.81% for
men and 4.01% for women, as found by Gotestam et al. in
a large outpatient Norwegian psychiatric population, using
a staff-report questionnaire [25]. Interestingly, men with
AN are 3.6 times more likely to present with an associated
diagnosis of schizophrenia than women [24].