This is a major study which is where the daly/qaly calcs come from. The severity of disability is the important bit. I assume it is a figure between 0 and 1. 0 is no disability. These would need to be recalculated for 1 to 10 for the JADI equation to work but they are already defined and this should be an easy calculation.
I am guessing 1 to 5 in the jadi equation is people who are employable in some form. A score of 10 is a quadraplegic doing a builders job or something like that.
With time the equation, particularly this coefficient, needs to be refined but it works with what is available. The coefficient doesn't only need to apply to established disabilities. It can work for race, gender or other stuff which is recognised as a factor of disadvantage. For example, gypsies and travllers might score a 5 even without a psychiatric or other diagnosis of disability. Organisations which employ people with this background are doing well to advantage those who are disadvantaged and excluded.
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