明白了为何全美因流感死亡每年有数万之多。

our model uses the frequency of influenza-related deaths that have cause of death related to pneumonia or influenza (P&I), other respiratory or cardiovascular (other R&C), or other non-respiratory, non-cardiovascular (non-R&C) to account for deaths occurring outside of a hospital by cause of death.

统计中包括死亡证明书中归类为其他呼吸心血管疾病，其他非呼吸非心血管疾病。中国未作此归类。