Egenvall A, Penell J C, Bonnett B N, Olson P, Pringle J
Department of Clinical Sciences, Faculty of Veterinary Medicine and Animal Science, Swedish University of Agricultural Sciences, SE-750 07 Uppsala, Sweden.
Vet Rec. 2006 Mar 25;158(12):397-406. doi: 10.1136/vr.158.12.397.
The aim of this study was to evaluate the potential usefulness of the database maintained by the Swedish insurance company Agria for providing mortality statistics on Swedish horses. Mortality statistics (incidence rates and survival) were calculated, both crudely and stratified by sex, age, breed, breed group and diagnosis, for the horses with complete life insurance, which covers most health problems. The total mortality was 415 (95 per cent confidence interval [CI] 399 to 432) deaths per 10,000 horse-years at risk, and the diagnostic mortality, including only deaths with an assigned diagnosis, was 370 (95 per cent CI 355 to 386) deaths per 10,000 horse-years at risk. The diagnostic mortality of geldings was 459 (95 per cent CI 431 to 487), of mares 345 (95 per cent CI 322 to 365) and of stallions 214 (95 per cent CI 182 to 247) deaths per 10,000 horse-years at risk. The mortality rates increased with age and differed widely between breeds. Survival analysis showed that the median age at death of the horses enrolled before they were one year of age was 18.8 years. The most common cause of death or euthanasia was joint problems, which were responsible for 140 (95 per cent CI 130 to 149) deaths per 10,000 horse-years at risk. The results of multivariable models developed by using Poisson regression generally agreed well with the crude results.
本研究的目的是评估瑞典农业保险公司（Agria）维护的数据库在提供瑞典马匹死亡率统计数据方面的潜在用途。对拥有涵盖大多数健康问题的全险马匹，按性别、年龄、品种、品种组和诊断进行了粗略计算以及分层计算，得出死亡率统计数据（发病率和存活率）。每10,000马年的风险中，总死亡率为415例死亡（95%置信区间[CI]为399至432），仅包括有指定诊断的死亡的诊断死亡率为每10,000马年的风险中370例死亡（95%CI为355至386）。每10,000马年的风险中，去势雄马的诊断死亡率为459例（95%CI为431至487），母马为345例（95%CI为322至365），种马为214例（95%CI为182至247）。死亡率随年龄增长而增加，且品种间差异很大。生存分析表明，一岁前登记的马匹的死亡中位年龄为18.8岁。最常见的死亡或安乐死原因是关节问题，每10,000马年的风险中有140例（95%CI为130至149）死亡。使用泊松回归建立的多变量模型结果与粗略结果总体上吻合良好。
