<p>Unadjusted modified Poisson regression assessing acute healthcare utilization within 30 days of a COVID-19 infection, or randomly assigned date¹ for periods without history of infection.</p>

Unadjusted modified Poisson regression assessing acute healthcare utilization within 30 days of a COVID-19 infection, or randomly assigned date1 for periods without history of infection.未校正改良泊松回归（modified Poisson regression）用于评估新冠病毒感染（COVID-19）后30天内的急性医疗服务利用情况，或针对无感染史的时段评估随机指定的日期1。