Triage protocols for intensive care units are based on priorities assigned to presents, but ignore patients about to arrive, so a priority newcomer may not find a ventilator and its associated nursing staff available because they are occupied by a lower-priority patient who however was present at the moment of assignment. Conversely, waiting too long leads to losing elderly patients who could have been saved by ventilators. As age and sex are major determinants of mortality by Covid-19 and have the merit, in contrast to other priority criteria, of being immediately available to health professionals, the criterion is the minimization of the mean mortality rate weighted by age- and sex-specific life expectancies. The dynamics is a queuing process involving mortality and return home flows and competition between ages. The result is the determination of an optimal threshold age that can guide triage.

重症监护病房的分诊方案基于分配给礼物的优先级，但忽略了即将到达的患者，因此优先级新人可能找不到可用的呼吸机及其相关护理人员，因为他们被优先级较低的患者占据，但该患者在场在分配的那一刻。相反，等待时间过长会导致失去本可以被呼吸机拯救的老年患者。由于年龄和性别是 Covid-19 死亡率的主要决定因素，并且与其他优先标准相比具有可立即提供给卫生专业人员的优点，因此该标准是将按年龄和性别加权的平均死亡率最小化-具体预期寿命。动态是一个排队过程，涉及死亡率和返乡流量以及年龄之间的竞争。