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There have been changes to the criteria for diagnosing post-traumatic
stress disorder (PTSD) in DSM-5 and changes are proposed for ICD-11.
To investigate the impact of the changes to diagnostic criteria for PTSD
in DSM-5 and the proposed changes in ICD-11 using a large multisite
trauma-exposed sample and structured clinical interviews.
Randomly selected injury patients admitted to four hospitals were
assessed 72 months post trauma (n = 510). Structured
clinical interviews for PTSD and major depressive episode, as well as
self-report measures of disability and quality of life were
Current prevalence of PTSD under DSM-5 scoring was not significantly
different from DSM-IV (6.7% v. 5.9%, z
= 0.53, P = 0.59). However, the ICD-11 prevalence was
significantly lower than ICD-10 (3.3% v. 9.0%,
z =–3.8, P<0.001). The PTSD
current prevalence was significantly higher for DSM-5 than ICD-11 (6.7%
v. 3.3%, z = 2.5, P
= 0.01). Using ICD-11 tended to show lower rates of comorbidity with
depression and a slightly lower association with disability.
The diagnostic systems performed in different ways in terms of current
prevalence rates and levels of comorbidity with depression, but on other
broad key indicators they were relatively similar. There was overlap
between those with PTSD diagnosed by ICD-11 and DSM-5 but a substantial
portion met one but not the other set of criteria. This represents a
challenge for research because the phenotype that is studied may be
markedly different according to the diagnostic system used.
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