Dissociative Identity Disorder (DID) is a controversial diagnosis and empirical data on the efficacy of treatment modalities are scanty. The objective of this study was to explore the frequency of the diagnosis, the types and efficacy of prevailing treatment practices, and to examine demographic data on patients in the Netherlands.

A questionnaire, including questions on one selected DID patient, was mailed to 1,452 Dutch psychiatrists. The response rate was 46.7%. A total of 273 psychiatrists reported having made the diagnosis at least once. The diagnosis was made in a statistically significant manner more frequently by female psychiatrists, by psychiatrists aged 50 years or younger, and by those certified after 1982. No correlation was observed with primary theoretical orientation or the type or topography of work facility.

The mean age of the selected patients was 33.2 and the male:female (M:F) ratio 1:9. The majority of patients were seen once a week in an outpatient setting. Individual psychotherapy and adjunctive anxiolytic or antidepressant medications were the most widely endorsed treatment modalities. Hypnosis was rarely used.

We conclude that the diagnosis of DID is not to be dismissed as a local eccentricity. It is warranted as an explanatory framework in the context of a psychotherapeutic treatment.

Multiple personality disorder (MPD) is being diagnosed with increasing frequency, especially in North America. However, soaring estimates of its current prevalence are accompanied by considerable controversy and heated debate. The author presents a number of grounds on which it seems reasonable to base a sceptical view of the validity of this disorder as a naturally occurring diagnostic entity.