<P> There is little systematic data on the prevalence of DID . It occurs more commonly in young adults and declines with age . Reported rates in the community vary from 1% to 3% with higher rates among psychiatric patients . It is 5 to 9 times more common in females than males during young adulthood, though this may be due to selection bias as males who could be diagnosed with DID may end up in the criminal justice system rather than hospitals . In children rates among females and males are approximately the same (5: 4). DID diagnoses are extremely rare in children; much of the research on childhood DID occurred in the 1980s and 1990s and does not address ongoing controversies surrounding the diagnosis . </P> <P> Though the condition has been described in non-English speaking nations and non-Western cultures, these reports all occur in English - language journals authored by international researchers who cite Western scientific literature and are therefore not isolated from Western influences . </P> <P> Rates of diagnosed DID were increasing, reaching a peak of approximately 40,000 cases by the end of the 20th century, up from less than 200 before 1970 . Initially DID along with the rest of the dissociative disorders were considered the rarest of psychological conditions, numbering less than 100 by 1944, with only one further case added in the next two decades . In the late 1970s and 80s, the number of diagnoses rose sharply . An estimate from the 1980s places the incidence at 0.01% . Accompanying this rise was an increase in the number of alters, rising from only the primary and one alter personality in most cases, to an average of 13 in the mid-1980s (the increase in both number of cases and number of alters within each case are both factors in professional skepticism regarding the diagnosis). Others explain the increase as being due to the use of inappropriate therapeutic techniques in highly suggestible individuals, though this is itself controversial while proponents of DID claim the increase in incidence is due to increased recognition of and ability to recognize the disorder . Figures from psychiatric populations (inpatients and outpatients) show a wide diversity from different countries . </P> <P> The DSM does not provide an estimate of incidence for DID and dissociative disorders were excluded from the Epidemiological Catchment Area Project . As a result, there are no national statistics for prevalence and incidence of DID in the United States . </P>

How many cases of did are there in the world
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