First and second waves among hospitalised patients with COVID-19 with severe pneumonia: a comparison of 28-day mortality over the 1-year pandemic in a tertiary university hospital in Italy.

BMJ Open · 2022 · PMC8724593 · PMID 34980623

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a decreasing trendno p-value reported

44 Indeed, using a risk prediction model to adjust for changes in the characteristics of patients admitted to critical care, they observed a decreasing trend in 28-day mortality over time.

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