Jane Hume (Victoria, Liberal Party, Assistant Minister for Superannuation, Financial Services and Financial Technology) | Hansard source

A top-quintile occupation, as in an emergency services worker, is as defined in the Work Health and Safety Act, or it is an occupation certified by a Fellow of the Institute of Actuaries of Australia to be a top-quintile risky occupation, based on rates of death, or death and total permanent disability, and that's using information from five years in relation to Australian occupations.