Five consecutive epidemiological waves of COVID-19: a population-based cross-sectional study on characteristics, policies, and health outcome.

BMC Infect Dis · 2022 · PMC9721063 · PMID 36471283

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a decreasing trendno p-value reported

Regarding para-clinical findings in patients infected with COVID-19, a decreasing trend was observed in the proportion of patients experiencing low levels of blood oxygen saturation up until the fifth wave where a dramatic increase was observed in the proportion of patients presenting with low levels of PaO2 saturation.

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