Table 2.

Association of blood type characteristics to noncritical vs. critical coronavirus disease 2019 (COVID-19) hospital presentation.

	Prevalence (%)			Unadjusted		Adjusted*
	Non-critical (n = 341)	Critical (n = 186)	p-value	Odds ratio (95% CI)	p-value	Odds ratio (95% CI)	p-value
Blood type			0.007
A	95 (27.9%)	65 (34.9%)		1.39 (0.95, 2.04)	0.091	1.46 (0.95, 2.25)	0.086
B	77 (22.6%)	57 (30.6%)		1.52 (1.00, 2.26)	0.048	1.50 (0.96, 1.65)	0.068
AB	23 (6.7%)	12 (6.5%)		0.95 (0.46, 1.96)	0.897	0.78 (0.35, 1.81)	0.575
O	146 (42.8%)	52 (28.0%)		0.52 (0.33, 0.76)	0.001**	0.51 (0.33, 0.79)	0.003**
Anti-A antibodies			0.090		0.091		0.080
No	95 (29.9%)	65 (37.4%)		1.00		1.00
Yes	223 (70.1%)	109 (62.6%)		0.71 (0.48, 1.05)		0.67 (0.43, 1.05)
Anti-B antibodies			0.042		0.042		0.163
No	77 (24.2%)	57 (32.8%)		1.00		1.00
Yes	241 (75.8%)	117 (67.2%)		0.65 (0.43, 0.98)		0.72 (0.45, 1.14)
A antigen			0.123		0.123		0.144
No	223 (65.4%)	109 (58.6%)		1.00		1.00
Yes	118 (34.6%)	77 (41.4%)		1.33 (0.92, 1.92)		1.36 (0.89, 2.06)
B antigen			0.068		0.068		0.275
No	241 (70.7%)	117 (62.9%)		1.00		1.00
Yes	100 (29.3%)	69 (37.1%)		1.42 (0.97, 2.07)		1.27 (0.82, 1.95)
Rh factor			0.706		0.706		0.817
Positive	316 (92.7%)	174 (93.5%)		1.00		1.00
Negative	25 (7.3%)	12 (6.5%)		1.14 (0.56, 2.34)		1.09 (0.49, 2.43)

^* Adjusted for age, gender, body mass index (BMI), and presence of comorbid conditions;

^**significant association.