Diagnostic classification and demographic features in 283 patients with somatoform disorder.

A total of 283 patients with somatoform disorder (SFD) seen in a psychiatry clinic were surveyed and their diagnostic subtypes, demographic features, and comorbidities, analyzed. The results indicate that: (i) SFD comprises 5.8% of first-visit outpatients; (ii) undifferentiated SFD (USFD) and SFD not otherwise specified (SFD-NOS) account for the majority of patients; (iii) there are 1.7-fold more women than men; (iv) age of onset is lower in patients with somatization disorder or body dysmorphic disorder and higher in patients with hypochondriasis or pain disorder; (v) the mean number of years of education was 11.2 years; and (vi) comorbid illness were seen in 24.8% of patients, and included mood disorder, anxiety disorder, and personality disorder, as well as borderline intellectual functioning and mental retardation. The data indicate that the majority of patients with SFD are given a diagnosis of residual category, such as USFD or SFD-NOS, and that the age of onset varies depending on the diagnostic subtype. SFD was more frequently seen in women, associated with comorbidities.