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Injury Statistics – Work-related Claims: 2013
Embargoed until 10:45am  –  15 October 2014
Data quality

Period-specific information
This section has information about data that has changed since the last release.

General information
This section has information on data that has not changed between releases.

Period-specific information

Reference period

This release contains provisional statistics for work-related claims for injuries in the 2013 calendar year. It also includes final statistics for injuries in the 2012 calendar year. Both of these are as reported by 8 August 2014.

Changes since the last release

Industry tables: the level 1 industry classification ‘Agriculture, forestry, and fishing’ has been further subdivided into ‘Agriculture’, ‘Forestry’, and ‘Fishing’, so that the number of claims in these industry groups can be monitored separately. This sub-classification has been added to tables 19, 20, and 21 in the provisional 2013 and final 2012 tables. Incidence rates are not available for agriculture, forestry and fishing separately.

Industry tables have been included in the trend tables for the first time. Improved management of claims since 2011 has resulted in more claims being coded to specific industries and fewer being coded as 'Not specified'. Keep this in mind when comparing year-on-year trends.

General information

Data sources

Data on claims for work-related injuries is from the Accident Compensation Corporation (ACC). All claims are included under the calendar year when the injury occurred. 2013 figures are provisional; final figures for 2013 will be published in 2015.

Figures for the number of full-time equivalent employees (FTEs) are sourced from the Household Labour Force Survey (HLFS). These figures are used to calculate incidence rates.

Accuracy of the data

Age

Age specifies an injured person's age at the date of injury. It is calculated from the date of birth. This age may differ from the worker's age when the claim is lodged, the age when compensation is received, or the age at death (if the worker dies of the injury).

Data on work-related injuries for people aged 14 years and under has been grouped into 'other and unspecified'. This is due to uncertainty about the ages recorded for people in this group. In previous years, claims by people aged 14 years and under made up less than 1 percent of total claims.

Claims

Claims by employees working for employers who are part of ACC’s Accredited Employer Partnership Programme are only included if they conform to the same data quality standard as normal claims managed by ACC. A significant proportion of accredited employer claims submitted by employers or their appointed administrators are not included in this release due to data quality issues.

Ethnic group reporting

Ethnic group reporting uses ‘total response’ for both the number of claims and the number of FTEs.

Total response counts the injured person once in every ethnic group they identify with. For example, people of Samoan, Tongan, and Māori ethnicities would be counted once in the ‘Pacific peoples’ category and once in the ‘Māori’ category.

Counting individuals in more than one ethnic group means the sum of the ethnic groups is greater than the number of people. However, it also means that all ethnicities are counted and identified in a specific unambiguous ethnic group and that the relative size of the groups within the population is fairly represented.

In this release, up to three separate ethnic groups are reported for each claim. Any remaining ethnic groups reported have been grouped as ‘other’ ethnicity. As multiple ethnicities are coded in the same manner by ACC and the HLFS, the numerator and denominator are consistent in the calculation of incidence rates.

Claims involving treatment at hospital accident and emergency departments

Treatment lasting less than three hours, and provided at a hospital accident and emergency department (ED), is bulk funded by ACC directly to the district health boards (DHBs) and is not recorded against individual claims. As a result, claims involving treatment provided at the ED for less than three hours are not included in this release.

Full-time equivalent employees

Because FTE numbers are derived from a sample survey (the HLFS), the FTE figures are subject to both sampling and non-sampling error, and should therefore be seen as indicative rather than definitive.

HLFS population rebase and incidence rates by ethnicity

The December 2008 quarter HLFS release included a population rebase that revised the statistical series back to the 2001 Census to reflect revisions to the population estimates derived from the 2006 Census. In addition, population benchmarks for the Māori ethnic group were introduced to improve the quality of the Māori estimates. All the figures including and subsequent to the 2007 final incidence rates are based on rebased FTE figures; however, earlier incidence rates have not been revised.

For most of the data, the FTE figures after the rebase were similar to those before the rebase, so that the incidence rate calculations were also similar. However, the new Māori population benchmark increased the number of FTEs for Māori. This change has caused a break in the series of incidence rates by ethnicity between 2006 and 2007. Therefore, trends in these rates are not discussed in this release.

Percentages

All percentages in the information release are calculated from unrounded data with the exception of percentages for fatal claims, where the percentages are calculated from rounded data. 

Rounding

All  fatal claim counts in the tables have been randomly rounded using the standard Statistics NZ random rounding to base 3 method. In this routine, all counts are randomly rounded up or down to one of the adjoining multiples of three (eg a count of five would be displayed as either 3 or 6, and a count of one would be displayed as either 0 or 3). Non-fatal claim counts are rounded to the nearest hundred. Rounding may result in totals disagreeing slightly with the total of individual items shown in the tables.

Consistency with other periods or datasets

Comparability with the serious injury outcome indicators

Data from ACC on work-related injury claims is also used for injury surveillance and monitoring through the serious injury outcome indicators. The indicators present annual frequencies and rates for outcomes of serious injury in New Zealand. For work-related injury, the indicators present measures for fatal injuries, and serious non-fatal injuries (these are injuries which meet a certain threshold of severity). They also present a serious injury indicator, which combines the fatal and serious non-fatal data. While the data used in the indicators has some similarities with the data used in this information release, there are some key differences:

  • The indicators contain high-level figures, while the information release contains a more detailed breakdown of the data.
  • The work-related fatalities published in the serious injury outcome indicators publication include work-related fatalities notified to WorkSafe New Zealand (formerly to the Ministry of Business, Innovation and Employment) as well as those for which an ACC claim was made.
  • The data is presented differently in each publication. The information release separates the data into all claims, entitlement claims, and fatal claims. The indicators present frequency and rates based on outcome of injury, ie fatal or not fatal, for serious and fatal claims only.
  • The indicators present data for fatal injuries as three-year moving averages, due to the small numbers. The information release publishes fatal data for single years, but uses random rounding on all numbers (see Rounding).

See Serious injury outcome indicator reports for more information.

Interpreting the data

Counting claims vs counting injuries

The data in this information release is for claims for work-related injuries, and is not a definitive count of all work-related injuries. This is because not all work-related injuries result in a claim to ACC.

Similarly for fatal injuries, the statistics in this release are not a definitive count of work-related fatalities. Firstly, not all fatal work-related injuries are the subject of claims to ACC. Secondly, in this release fatal work-related injuries are counted in the year that the injury took place. This differs from ACC's practice of counting work-related deaths in the year that the death took place.

Classifications used in the information release

Employment status

Employment status indicates whether a worker is self-employed (that is, working for himself/herself), or is an employee (working for another person or entity).

Employment status covers all those 'working for wages and salaries', including those working employers who belong to the ACC partnership programme. The self-employed figures include those classified as 'self-employed and not employing others', but exclude those 'working without pay or profit in a family business'. While this differs from the definition in the Household Labour Force Survey (HLFS), it corresponds closely to definitions used for workplace accident insurance.

Industry

The Australian and New Zealand Standard Industrial Classification (ANZSIC), New Zealand Version 2006, (Version 1.0) is used to classify each business by industry.

Occupation

Occupation is classified according to the New Zealand Standard Classification of Occupations (NZSCO), 1995, Version 2.0.

Liability

While all care and diligence has been used in processing, analysing, and extracting data and information in this publication, Statistics NZ gives no warranty it is error-free and will not be liable for any loss or damage suffered by the use directly, or indirectly, of the information in this publication.

Timing

Our information releases are delivered electronically by third parties. Delivery may be delayed by circumstances outside our control. Statistics NZ does not accept responsibility for any such delays.

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