Table 3.

Gender-stratified analysis of ABO blood type and COVID-19 cases.

Blood group	Male		χ2	P	OR (95% CI)	Female		χ2	P	OR (95% CI)
	Case	Control				Case	Control
A	21	18	0.44	0.51	1.14 (0.78–1.67)	24	12	5.24	0.02	1.56 (1.08–2.27)
B	17	19	0.12	0.73	0.93 (0.62–1.41)	11	13	0.42	0.52	0.85 (0.53–1.39)
AB	6	5	0.12	0.73	1.13 (0.63–1.98)	3	6	1.32	0.25	0.62 (0.24–1.61)
O	11	14	0.40	0.53	0.86 (0.53–1.40)	12	16	1.19	0.28	0.78 (0.48–1.26)

OR, odds ratio after adjustment; CI, confidence interval.