Mortality in an Italian nursing home during COVID-19 pandemic: correlation with gender, age, ADL, vitamin D supplementation, and limitations of the diagnostic tests.

Introduction: The COVID-19 pandemic caused an increased mortality in nursing homes due to its quick spread and the age-related high lethality Results: We observed a two-month mortality of 40%, compared to 6 4% in the previous year This increase was seen in both COVID-19 positive (43%) and negative (24%) residents, but 8 patients among those testing negative on the swab, tested positive on serological tests Increased mortality was associated with male gender, older age, no previous vitamin D supplementation and worse "activities of daily living (ADL)" scores, such as Barthel index, Tinetti scale and S OS I A classification Conclusion: Our data confirms a higher geriatric mortality due to COVID-19 Negative residents also had higher mortality, which we suspect is secondary to preanalytical error and a low sensitivity of the swab test in poorly compliant subjects Male gender, older age and low scores on ADL scales (probably due to immobility) are risk factors for COVID-19 related mortality Finally, mortality was inversely associated with vitamin D supplementation Design: In this observational study, we described the two-month mortality among the 157 residents (age 60-100) of a nursing home after Sars-CoV-2 spreading, reporting the factors associated with the outcome We also compared the diagnostic tests for Sars-CoV-2