The higher rate of the catatonic subtype of schizophrenia diagnosed in the early part of the century has been attributed to the following:

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The catatonic subtype of schizophrenia was diagnosed more frequently in the early part of the century, and it has been suggested that some patients diagnosed with schizophrenia actually had other illnesses, such as "sleeping sickness," which can cause catatonic symptoms. Therefore, the higher rate of catatonic subtype diagnoses may have been due to misdiagnosis rather than a true increase in the prevalence of the subtype.

The Higher Rate of the Catatonic Subtype of Schizophrenia Diagnosed