how many cases of did are there in the world
Dissociative identity disorder 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.[20][10] 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.[11] In the late 1970s and 80s, the number of diagnoses rose sharply.[11] An estimate from the 1980s places the incidence at 0.01%.[20] 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).[11] Others explain the increase as being due to the use of inappropriate therapeutic techniques in highly suggestible individuals, though this is itself controversial[39][43] while proponents of DID claim the increase in incidence is due to increased recognition of and ability to recognize the disorder.[10] Figures from psychiatric populations (inpatients and outpatients) show a wide diversity from different countries.[74]
World population estimates Estimates of the "total number of people who have ever lived" is 107.6 billion as of 2011.[11] The answer naturally depends on the definition of "people", i.e. is only Homo sapiens to be counted, or all of genus Homo, but due to the small population sizes in the Lower Paleolithic, the order of magnitude of the estimate is not affected by the choice of cut-off date substantially more than by the uncertainty of estimates throughout the Neolithic to Iron Age.[12] The estimate is more crucially affected by the estimate of infant mortalitys vs. stillborn infants, due to the very high infant mortality throughout the pre-modern period. An estimate on the "total number of people who have ever lived" as of 1995 was calculated by Haub (1995) at "about 105 billion births since the dawn of the human race" with a cut-off date at 50,000 BC (beginning of the Upper Paleolithic), and an inclusion of a high infant mortality rate throughout pre-modern history.[13]