While aggregate COVID-19 case and death numbers are being reported to WHO, they do not always provide a complete picture of the health burden attributable to COVID-19.
4474
一般而言，报告的死亡人数都低估了大流行造成的死亡人数，出现这种情况有几方面原因。
In general, reporteddeath numbers under-estimate the number of lives lost due to the pandemic, there are several reasons for this.
4475
数值未计入那些未经检测而死亡者；
They miss those who died without testing, they are contingent on the country correctly defining COVID as the cause-of-death and they miss the increases in other deaths that are related to the pandemic leading to overwhelmed health systems or patients avoiding care.
4476
数值取决于一国有无正确地将COVID定义为死因；
A few countries have experienced lower than expected total deaths during the pandemic due to reduced contact and reduced mobility, which have led to reduced infectious disease related mortality as well as reduced transport and injury related fatalities.
4477
数值未计入与大流行相关的其他死亡人数的增加，这也导致卫生系统不堪重负或患者逃避护理。
ReportedCOVID-19 death numbers do not account for this.
In light of the challenges posed by using reported data on COVID-19 cases and deaths, excess mortality is considered a more objective and comparable measure that accounts for both the direct and indirect impacts of the pandemic.
4479
为什么估计数显示一些国家的超额死亡人数为负值？
Why do the estimates show negative excess deaths for some countries?
Negative excess deaths could be observed if deaths that would have happened in the absence of the pandemic were averted due to measures taken to deal with the pandemic.