Workers in each trade sector are identified using the 2013 census. Only those in trade roles are included. Work-related ACC claims made by these workers within three years before or after the census. Because the census only gives a workforce at a point in time, we must choose a window around the census that is large enough to contain a significant number of claims, but small enough that not too many of the claims are made while the worker is in a different industry.
Access to the anonymised data used in this study was provided by Statistics New Zealand in accordance with security and confidentiality provisions of the Statistics Act 1975, and secrecy provisions of the Tax Administration Act 1994. The findings are not Official Statistics. The results in this paper are the work of the authors, not Statistics NZ, and have been confidentialised to protect individuals, households, businesses, and other organisations from identification. Read our full disclaimer here.