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（Survival Risk Ratios，SRRs）基于澳大利亚的关联住院与死亡数据计算得出。住院入院数据采集自澳大利亚各卫生部门及澳大利亚卫生与福利研究所（Australian Institute of Health and Welfare, AIHW），涵盖2002年7月1日至2012年6月30日期间，年龄≤16岁儿童的全部损伤相关住院病例，此类病例以损伤作为主要诊断编码（ICD-10-AM：S00-T89）。澳大利亚首都领地（Australian Capital Territory, ACT）的可用数据仅始于2004年7月1日。死亡数据取自国家死亡索引（National Death Index）。住院与死亡数据由澳大利亚卫生与福利研究所数据链接单元（Australian Institute of Health and Welfare Data Linkage Unit）完成概率性关联。澳大利亚≤16岁儿童的估算总人口为450万。研究针对每一类损伤诊断计算了SRRs。SRR的通用定义为：某一损伤诊断下未发生死亡的个体数与该损伤诊断总病例数的比值。SRR可用于估算损伤严重程度，即国际损伤严重程度分类评分（International Classification of Injury Severity Score, ICISS）。ICISS的计算方式为将SRR应用于研究数据集内的每一项损伤诊断编码。针对本研究的儿童群体，SRR的定义为：某一损伤诊断下未发生死亡的儿童人数与该损伤诊断总患病人数的比值。目前常用两种方法估算ICISS值：① 多损伤乘积法ICISS：即ICISS为患儿所有损伤对应的SRR的乘积；② 单一最严重损伤法：仅将最严重损伤（即SRR最低的损伤诊断）作为唯一最严重损伤来计算ICISS。