Psychoactive substance use diagnoses among psychiatric in-patients.

Objective: To estimate the prevalence and possible under-diagnosing of substance use disorders and to consider factors that might influence diagnosing of substance use disorders.

Method: Data collected from case records and PSE interviews of psychiatric in-patients from 12 psychiatric departments in Denmark admitted during October 1996 were compared with data from the Danish Psychiatric Register.

Results: A substantially lower prevalence of substance use diagnoses were found in the register (26.