Although the two disease concepts have very different histories, many
previous studies have mixed conversion disorder and somatization disor
der and none has made direct comparison between them. The authors appl
ied DSM-III criteria to inpatient and outpatient medical records and a
ttempted to follow 98 patients who met criteria for somatization disor
der or conversion disorder. Five of these patients died 4 years later
and, of those who survived, 70 (75.3%) Were given follow-up intel view
s by a rater blind to baseline diagnosis. The 32 patients with a basel
ine diagnosis of conversion disorder were significantly less likely th
an the 38 patients with somatization disorder to be given the same dia
gnosis at follow-up. Six of the conversion disorder patients were give
n follow-up diagnoses of somatization disorder and, in four other case
s, subsequent developments revealed medical explanations for the prese
nting complaint. Of the two baseline diagnoses, somatization disorder
predicted substantially more impairment in a variety of domains.