NEW ZEALAND INJURY PREVENTION STRATEGY SERIOUS INJURY OUTCOME INDICATORS

Transcription

1 NEW ZEALAND INJURY PREVENTION STRATEGY SERIOUS INJURY OUTCOME INDICATORS

2 166 MOTOR VEHICLE CRASHES IN NEW ZEALAND 2012 CONTENTS TABLES Table 1 New Zealand Injury Prevention Strategy serious outcome indicators 168 FIGURES Figure 1 Motor vehicle traffic crash fatal age standardised rate (M12) 168 Figure 2 Motor vehicle traffic crash serious non-fatal age standardised rate (M02) 169 Figure 3 Motor vehicle traffic crash serious (fatal and non-fatal) age standardised rate (M22) 169

3 NEW ZEALAND INJURY PREVENTION STRATEGY SERIOUS INJURY OUTCOME INDICATORS 167 NOTES 1. The New Zealand Injury Prevention Strategy (NZIPS) The NZIPS is an expression of the government s commitment to working with organisations and groups in the wider community to improve the country s prevention performance. The Strategy s vision is a safe New Zealand, becoming free. (For further details see Motor vehicle traffic crashes is one of the six priority areas identified in the strategy. 2. NZIPS serious indicators Official serious outcome indicators have been developed for each of the six priority areas as the main means of measuring performance in reducing. Chart books with the full set of indicators can be found by visiting the Statistics NZ website: and searching for NZIPS serious indicators Several of the official NZIPS indicators for motor vehicle traffic crashes are presented in this section. 3. What is a serious? The definition of serious adopted for the official NZIPS indicators is: serious injuries are those that result in death or an admission to hospital that is associated with at least a 6 percent chance of death. The methods by which cases of fatal and serious non-fatal are identified are described briefly in The New Zealand Injury Prevention Strategy Injury Indicators: Technical Report. The technical report can be found on the Statistics NZ website. 4. The graphs Time period Where possible, the period presented for serious non-fatal injuries is 2000 to For fatal injuries, the period presented is 2000 to Because many cases of -related death are required to be reviewed by a Coroner, there is a time delay in the recording of the cause of fatal. Hence, 2010 is the most recent year available for the mortality data. the number of deaths and hospitalisations attributable to. Readers should exercise caution if commenting on trends that include indicator values based on both ICD-9 and ICD-10 coded data. For this reason, the bars on the graphs have been shaded differently to highlight the change. Intermediate shading has been used for the bars for 1999 for indicators based on hospitalisation data, because 1999 was a transitional year when both ICD-9 and ICD-10 coding systems were used. The baseline provides a point from which to compare the frequencies and rates of injuries. It is the average count or rate of for the three years leading up to the launch of NZIPS ( ). Confidence intervals Each bar on each chart has confidence intervals shown as vertical lines. These give an indication of the amount of random variation associated with a single year s indicator value. Where wide confidence intervals are displayed, little weight should be given to the variation from one year to the next it could be due to chance alone. When considering trends, observing the degree of overlap of confidence intervals for individual bars (years) is helpful as an aid to interpretation of trends. If confidence intervals do not overlap the baseline, this is indicative of a change from baseline that is unlikely to be due to chance alone. 5. Age standardised rates Age standardised rates provide an estimate of an individual s average annual risk of being injured. Age standardisation is a process of adjusting the rates of to account for changes in the age structure of a population over time. It allows comparison of the rates of from one year to another, taking into account the ageing population. Bar shading The coding scheme used for the diagnosis of is the World Health Organization (WHO) International Classification of Diseases (ICD)4. During the period considered in these charts, the ICD was substantially revised, and a new version of the coding scheme was introduced (from ICD-9 to ICD-10, refer Technical Report). This change has resulted in some differences in

4 168 MOTOR VEHICLE CRASHES IN NEW ZEALAND 2012 TABLE 1: NEW ZEALAND INJURY PREVENTION STRATEGY SERIOUS INJURY OUTCOME INDICATORS NUMBER OF SERIOUS INJURIES AGE STANDARDISED RATE (PER 100,000 PERSON YEARS AT RISK) Fatal Serious non-fatal Fatal and serious Fatal Serious non-fatal Fatal and serious M11 M01 M21 M12 M02 M Fatal Non-fatal Population Ministry of Health Mortality Collection Ministry of Health National Minimum Data Set Statistics New Zealand FIGURE 1: MOTOR VEHICLE TRAFFIC CRASH FATAL INJURY AGE STANDARDISED RATE (M12) Rate (per 100,000 person years at risk) NOTE: 2009 and 2010 data are provisional NUMERATOR SOURCE: Ministry of Health Mortality Collection DENOMINATOR SOURCE: Statistics New Zealand

5 NEW ZEALAND INJURY PREVENTION STRATEGY SERIOUS INJURY OUTCOME INDICATORS 169 FIGURE 2: MOTOR VEHICLE TRAFFIC CRASH SERIOUS NON-FATAL INJURY AGE STANDARDISED RATE (M02) Rate (per 100,000 person years at risk) NOTE: 2011 data are provisional NUMERATOR SOURCE: Ministry of Health National Minimum Data Set DENOMINATOR SOURCE: Statistics New Zealand FIGURE 3: MOTOR VEHICLE TRAFFIC CRASH SERIOUS (FATAL AND NON-FATAL) INJURY AGE STANDARDISED RATE (M22) Rate (per 100,000 person years at risk) NOTE: 2009 and 2010 data are provisional NUMERATOR SOURCE: Ministry of Health National Minimum Data Set and Mortality Collection DENOMINATOR SOURCE: Statistics New Zealand

6 170 MOTOR VEHICLE CRASHES IN NEW ZEALAND 2012