Car ownership at early licensure for young drivers has been identified as a crash risk factor, but for how long this risk persists is unknown. This study examined crash hazard rates between young drivers with their own vehicle and those who shared a family vehicle at early licensure over 13 years. The DRIVE study, a 2003/04 survey of 20,806 young novice drivers in New South Wales, Australia was used to link to police crash, hospital and death records up to 2016. The first police-reported crash and crash resulting in hospitalisation/death was modelled via flexible parametric survival analysis by type of vehicle access at baseline (own vs. shared family vehicle). After adjusting for covariates, drivers with their own vehicle at early licensure had an almost 30 % increased hazard rate for any crash after one year (95 % CI:1.16–1.42) compared with those who only had access to a family car and this attenuated but remained significantly higher until year 7 (HR: 1.1, 95 % CI: >1.00–1.20). For crashes resulting in hospitalisation or death, an almost 15-times higher hazard (95 % CI: 1.40–158.17) was observed at the start of follow up, remaining 50 % to year 3 (95 % CI:1.01–2.18). Parents and young drivers should be aware of the increased risks involved in car ownership at early licensure. Development of poorer driving habits has been associated with less parental monitoring at this time. Graduated Driving Licensing educators, researchers and stakeholders should seek to address this and to identify improved safety management options.

中文翻译：

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年轻驾驶员较早拥有自己的汽车和成年早期的碰撞风险：DRIVE 研究的结果

年轻司机早期获得驾照时拥有汽车已被确定为撞车风险因素，但这种风险会持续多久尚不清楚。这项研究调查了 13 年来拥有自己车辆的年轻驾驶员与早期获得驾照时共享家庭车辆的年轻驾驶员之间的碰撞危险率。DRIVE 研究是 2003/2004 年对澳大利亚新南威尔士州 20,806 名年轻新手司机进行的一项调查，用于连接截至 2016 年的警察车祸、医院和死亡记录。警方报告的第一起车祸和导致住院/死亡的车祸是通过灵活的参数生存分析根据基线车辆访问类型（自有车辆与共享家庭车辆）进行建模。调整协变量后，与仅拥有家用汽车的驾驶员相比，在早期获得驾照时拥有自己车辆的驾驶员一年后发生碰撞的危险率几乎增加了 30%（95% CI：1.16–1.42）但直到第 7 年之前仍显着较高（HR：1.1，95% CI：>1.00–1.20）。对于导致住院或死亡的车祸，在随访开始时观察到的风险几乎高出 15 倍（95% CI：1.40–158.17），到第 3 年仍保持 50%（95% CI：1.01–2.18）。父母和年轻司机应该意识到，在早期获得驾照时拥有汽车所涉及的风险会增加。此时，不良驾驶习惯的养成与父母监控的减少有关。毕业驾驶执照教育者、研究人员和利益相关者应设法解决这个问题并确定改进的安全管理方案。