China
Descriptive (Case report/series)
Medical records
1775
Patients infected with SARS-CoV-2 in Wuhan Jinyintan Hospital. Controls (Wuhan Area) N=3694
none
0
COVID-19 (any condition)
Patient characteristics
ABO blood group
Persons with other than AB blood group
1597
4955
AB blood group
178
514
Odds ratio
1.110 (0.920-1.350)
No
Yes
random effects model
Average