From the percentages obtained across the world and between the in-patients to outpatients the considerable variance shows that the way the studies are carried out (semi or fully structured environment), choice of diagnostic instrument and what the social norms in each location are, as well as cultural differences seem to have a major impact on how each person is able to move past their traumatic experience. Murphy, 1994; Ross, 1991; Waller & Ross, 1997 suggested that people with dissociative amnesia account for approximately 3 - 5% of in-patients and emergency hospitalized psychiatric patients requiring immediate crisis.
