Survival risk ratios for ICD-10-AM injury diagnosis classifications for children

The survival risk ratios (SRRs) were calculated using linked
hospitalisation and mortality data from Australia. Hospital admissions was obtained from each
Health Department or the Australian Institute of Health and Welfare and
included all injury-related admissions identified using a principal diagnosis
of injury (ICD-10-AM: S00-T89) of children aged ≤16 years during 1 July 2002 to
30 June 2012. In the Australian Capital
Territory (ACT) data were only available from 1 July 2004. Mortality data was obtained from the National
Death Index. Hospitalisation and
mortality data were probabilistic linked by the Australian Institute of Health
and Welfare Data Linkage Unit. There
were an estimated population of 4.5 million children aged ≤16 years in
Australia.

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. A SRR represents the ratio of the number of children with each
injury diagnosis who did not die to the total number of children with the
injury diagnosis. There are two methods commonly used to estimate ICISS
values: (i) multiplicative-injury ICISS where ICISS is the product of all
SRRs for each of the child’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.

生存风险比（SRRs）的计算基于澳大利亚的住院与死亡关联数据。住院数据来源于各州卫生部门或澳大利亚卫生福利研究所，包含2002年7月1日至2012年6月30日期间16岁及以下儿童中，以损伤为主要诊断（ICD-10-AM：S00-T89）的所有损伤相关入院病例。澳大利亚首都领地（ACT）的数据仅从2004年7月1日起可用。死亡数据来源于国家死亡指数。住院与死亡数据由澳大利亚卫生福利研究所数据关联单元通过概率匹配方式关联。澳大利亚16岁及以下儿童的估计人口为450万。

针对每种损伤诊断计算SRR。SRR表示具有该损伤诊断且未死亡的个体数与具有该损伤诊断的总个体数之比。SRR可用于评估损伤严重程度（即国际损伤严重度评分：ICISS）。ICISS通过将SRR应用于数据中的每个损伤诊断代码来计算。SRR表示具有该损伤诊断的儿童中未死亡人数与具有该损伤诊断的儿童总人数之比。常用的ICISS估计方法有两种：（i）多损伤乘积法ICISS，即取儿童所有损伤对应的SRR的乘积；（ii）单一最严重损伤法，即仅将最严重损伤（即SRR最低的损伤诊断）对应的SRR作为ICISS值。