id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
cord-271485-a1633xxe	Leaf, Rebecca Karp	ABO Phenotype and Death in Critically Ill Patients with COVID‐19	2020-07-01		.txt	text/plain	1585	91	53	6 To examine the relationship between blood group and clinical outcomes in patients with COVID-19, we studied the distribution and mortality associated with ABO phenotype in a large cohort of critically ill patients. To examine whether blood type is associated with critical illness in patients with COVID-19, we used a chi-square test to compare the observed versus expected distribution of ABO phenotypes. We estimated the expected distribution of ABO phenotype in each of the above race/ethnicity categories using data from 3.1 million blood donors in the United States. 7 To examine whether ABO phenotype is associated with mortality among critically ill patients with COVID-19, we used a chi-square test to compare the distribution of observed ABO blood phenotypes with 28-day in-hospital mortality, stratified by the above race/ethnicity categories. In this large nationwide cohort study of critically ill patients with COVID-19, we found significant differences in the observed versus expected distribution of ABO phenotypes among White patients,	./cache/cord-271485-a1633xxe.txt	./txt/cord-271485-a1633xxe.txt