. Severe Aboriginal Over-Representation
Victorian Government Aboriginal Affairs Reports demonstrate persistently disproportionate removal of Aboriginal children:

In 2023-24, the rate of Aboriginal children in OOHC in Victoria was 90.5 per 1,000, 20.6 times higher than non-Aboriginal children. firstpeoplesrelations.vic.gov.au
National data also shows Victoria’s rates worsening over time, despite policy acknowledgment of ongoing injustice tied to historical child removal practices (Yoorrook). firstpeoplesrelations.vic.gov.au
This reflects structural systemic inequity but most reporting remains at a macro OOHC level, not specific to PCO outcomes.

 Historical Data Shows Few Revocation Attempts
Historical Children’s Court research (2012–14) provides contextual data useful for pattern-seeking:

Out of 25 applications to revoke a PCO between April 2012 and February 2014, only a small minority were lodged by birth parents, and most were struck out or had limited success. cpmanual.vic.gov.au
Although old, this is the only documented quantitative window publicly available. It signals that revocation attempts have been few and largely unsuccessful even prior to the current statutory framework.