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NSW injury SRRs.csv (24.71 kB)

Survival risk ratios for ICD-10-AM injury diagnosis classifications for all ages

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posted on 2021-07-01, 05:56 authored by Rebecca MitchellRebecca Mitchell, Hsuen P Ting

The survival risk ratios (SRRs) were calculated using linked hospitalisation and mortality data from New South Wales (NSW), Australia. Hospital admissions was obtained from the NSW Ministry of Health and included all injury-related admissions identified using a principal diagnosis of injury (ICD-10-AM: S00-T89) during 1 January 2010 to 30 June 2014. Mortality data was obtained from the NSW Registry of Births, Deaths and Marriages from 1 January 2010 to 31 March 2015. Hospitalisation and mortality data were probabilistic linked by the Centre for Health Record Linkage (CHeReL). NSW covers an area of 800,628km2 with a population of around 7.7 million.

The SRRs were calculated for each injury diagnosis. A SRR represents the ratio of the number of individuals with each injury diagnosis who did not die to the total number of individuals with the injury diagnosis. The SRRs can be used to estimate injury severity (i.e. the International Classification of Injury Severity Score: ICISS). The ICISS is calculated by applying the SRRs to each injury diagnosis code in your data. There are two methods commonly used to then estimate ICISS values: (i) multiplicative-injury ICISS where ICISS is the product of all SRRs for each of the individual’s injuries; and (ii) single worst-injury, where ICISS only includes the worst-injury (i.e. the injury diagnosis with the lowest SRR) as the single worst-injury.


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