Table 4 Rate of positive test by blood type. Overall P value 0.036 derived by Chi-squared testing. Adjusted odds ratio (AOR) with adjustment for sex, primary language, age, and rhesus factor with each blood type compared to all others. Rh+ model included blood type as a categorical covariate. Rh+: Rhesus factor positive. Hosmer and Lemeshow goodness of fit p > .5 for all models

From: Blood type and outcomes in patients with COVID-19

Blood type Total N N positive (%) AOR (95% CI) P value
A 2649 440 (16.6) 1.00 (0.88–1.13) 0.96
B 1035 201 (19.4) 1.28 (1.08–1.52) 0.004
AB 308 61 (19.8) 1.37 (1.02–1.83) 0.035
O 3656 587 (16.1) 0.84 (0.75–0.95) 0.007
Rh+ 6707 1161 (17.3) 1.22 (1.003–1.50) 0.047
All 7648 1289 (16.9)