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The latent structure of the proposed ICD-11 post-traumatic stress
disorder (PTSD) symptoms has not been explored.
To investigate the latent structure of the proposed ICD-11 PTSD
Confirmatory factor analyses using data from structured clinical
interviews administered to injury patients (n = 613) 6
years post-trauma. Measures of disability and psychological quality of
life (QoL) were also administered.
Although the three-factor model implied by the ICD-11 diagnostic criteria
fit the data well, a two-factor model provided equivalent, if not
superior, fit. Whereas diagnostic criteria based on this two-factor model
resulted in an increase in PTSD point prevalence (5.1%
v. 3.4%; z = 2.32,
P<0.05), they identified individuals with similar
levels of disability (P = 0.933) and QoL
(P = 0.591) to those identified by the ICD-11
Consistent with theorised reciprocal relationships between
re-experiencing and avoidance in PTSD, these findings support an
alternative diagnostic algorithm requiring at least two of any of the
four re-experiencing/avoidance symptoms and at least one of the two
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