"Health policy reforms in New Zealand during the 1990s impacted on hospital operations, on the nursing workforce, and on patients. This study analyses changes in rates of 20 adverse patient outcomes that are potentially sensitive to nursing (OPSNs) before (1989-1993), during (1993-2000), and after (2000-2006) the policy reforms, using all New Zealand public hospital inpatient discharge data for this period." (excerpt from abstract)