Allele Frequency of ABO Blood Group Antigen and the Risk of Esophageal Cancer

Table 2

Chi-square test value and significance of ABO blood group and Rh status.

Cases * control (𝑛)	ABO blood group		Rh status
	𝜒^2 test	𝑃 value	𝜒^2 test	𝑃 value
All	20.296	0.0001	13.964	0.0001
Male	9.611	0.0221	5.484	0.0191
Female	17.177	0.0006	8.874	0.0028
Site of cancer; Case * control (%)
Upper	1.348	0.717	0.785	0.375
Middle	2.3447	0.484	2.791	0.094
Lower	12.06	0.007	4.223	0.039

Degree of freedom = 1.