Risk of COVID-19 Disease Severity with Blood Type
Crude and adjusted analyses showed that ABO blood type significantly
predicted the risk of COVID-19 severity (Table 4). Adjusted analyses,
upon controlling age and COVID-19 vaccination, revealed that blood type
A was 52% and 25% at greater risk for developing asymptomatic-to-mild
(aRR=1·52, p =0·040) and severe-to-critical COVID-19 (aRR=1·25,p =0·041), respectively. Blood type AB, on the other hand, was
62% at higher risk for moderate COVID-19 (aRR=1·62, p =0·037)
compared to non-AB blood type. Interestingly, those with blood type O
(aRR=0·65, p =0·010) have a lower risk for moderate COVID-19 by
54%.
[INSERT TABLE 4 HERE]