JOURNAL ARTICLE

Consistency of diagnostic thresholds in DSM-V

Gavin Andrews, Matthew Sunderland, Alice Kemp
Australian and New Zealand Journal of Psychiatry 2010, 44 (4): 309-13
20050722

OBJECTIVE: DSM-IV diagnostic criteria define thresholds on a continuum of symptoms above which the diagnosis is said to be established. Data from the 1997 Australian Survey of Mental Health and Wellbeing were used for six internalizing disorders, and the levels of distress and disability associated with each diagnosis were investigated.

METHOD: Mean distress (measured by the K-10) and disability (measured by the SF12-MCS) scores were identified for people in the Survey who reported no physical or mental disorders. The distribution of distress and disability showed by people who met criteria for major depressive disorder, dysthymia, generalized anxiety disorder, social phobia, post-traumatic stress disorder and obsessive-compulsive disorder was plotted against the mean for well people, expecting that > or = 90% of people with these mental disorders would score as more distressed or disabled than this mean.

RESULTS: More than 90% of people with dysthymia, major depressive disorder, generalized anxiety disorder or with post-traumatic stress disorder scored as more distressed or disabled than the mean for well people. A majority were severely distressed or disabled (> 2SD above the mean). This remained the case when the clinical significance criteria were removed. In social phobia and in obsessive-compulsive disorders between 9% and 26% scored below the means for well people, that is, as neither distressed nor disabled, a figure that rose to 16-40% when the clinical significance criteria were removed. In neither case did a majority of cases score in the severe range.

CONCLUSIONS: The diagnostic thresholds for social phobia and for obsessive-compulsive disorder are less stringent than that for the other disorders and require revision in DSM-V.

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