The following article is a useful one if a few years old now: http://www.gelmans.com/Articles/Waddell97.html
Though relating to Industrial Injuries Jacob's decision CI/1756/02 is worth a quote.
"7. The first expression, voluntary restriction, is clear in its meaning. The medically qualified panel members found that the claimant did not move his back as much as he could and that, this is the important point, that the restriction was under his voluntary control. In other words, to the extent that the movements were restricted voluntary, they did not form part of his disablement.
8. The other expressions, inappropriate signs and illness behaviour, are less clear in their meaning. They may mean the same as voluntary restriction. They may also mean that the claimant is demonstrating a disablement that is not attributable to the normal process of injury or disease, but is a result of the claimant’s mental reaction. In this latter sense, the behaviour is not within the claimant’s conscious control. The same confusion arises with references to Waddell signs. These signs are often misunderstood both by tribunals and even by doctors who examine for the purposes of benefit entitlement. They are not signs of deliberate misrepresentation of disablement."
To quote the American Journal of Medical Science in October 2002:
"Various approaches have been made to describe and quantify symptom magnification, with the most prevalent approach being Waddell nonorganic signs in the evaluation of low back pain. These approaches are limited, however, in that formal study of the techniques of evaluating symptom magnification has not been done. As Waddell put it in a retrospect of the nonorganic signs bearing his name:“Multiple signs suggest that the patient does not have a straightforward physical problem, but that psychological factors also need to be considered. Some patients may require both physical management of their physical pathology and more careful management of the psychosocial and behavioral aspects of their illness. Behavioral signs should be understood as response affected by fear in the context of recovery from injury and the development of chronic incapacity. They offer only a psychological “yellow-flag” and not a complete psychological assessment. Behavioral signs are not on their own a test of credibility or faking." Volume 324(4) October 2002 pp 220-226 ]
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