BioMed Research International / 2014 / Article / Tab 3

Research Article

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

Table 3

Presence of B antigen (B and AB blood groups) and absence of B antigen (O and A blood groups); Chi-square test with significance and odd ratio.

Presence of B (B + AB)Absence of B (O + A) Chi-square valueOdds ratio CI = 95%

All
 Cases480284 (59.17)196 (40.83)16.58<0.00011.691.31–2.19
 Control480221 (46.04)259 (53.96)
Male
 Cases252147 (58.33)105 (41.67)6.240.0121.571.10–2.24
 Control240113 (47.1)127 (52.9)
Female
 Cases228137 (60.1)91 (39.9)10.670.0011.841.27–2.65
 Control240108 (45)132 (55)
Site of cancer (case)
 Upper8645 (52.3)41 (47.7)0.2120.645
 Middle192109 (56.77)83 (43.23)1.8330.175
 Lower202130 (64.36)72 (35.64)8.2480.004

Degree of freedom = 1.
Values in parentheses are percentages.