I came across this paper recently and thought it might be of interest to you. It is a little out of date but the general information remains applicable. The last 2 tables are especially interesting with an overview of thresholds and an overview of methods.
Role of Impairment Assessment in Australian & NZ Injury Compensation Schemes
Andrew Fronsko and David Swift
ISCRR 1st Australian Compensation Health Research Forum
October 2011
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