| http://www.w3.org/ns/prov#value | - Based on a model prevalent in the literature, the index is an attempt to represent the underlying medically related aspects of disability in contrast to other factors such as the person's age, educational level, or work history.Social Security Bulletin, Vol. 42 No. 3(released March 1979)Effect of Substantial Gainful Activity Level on Disabled Beneficiary Work Patternsby Paula A. Franklin and John
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