Table 1.

Mean age and frequencies of ABO histo-blood group phenotypes of patients with allergic rhinitis and controls

Phenotypes		Patients	Controls		OR	CI 95%	p-value**
ABO*	n	%	n	%
A	53	31.5	68	40.4	0.677	0.432- 1.061	0.111
B	18	10.7	21	12.5	0.840	0.430- 1.641	0.733
AB	3	1.8	8	4.7	0.363	0.094- 1.396	0.218
O	94	56.0	71	42.4	1.735	1.127- 2.673	0.016
Total	168	100.0	168	100.0

*For all ABO histo-blood group phenotypes of patients and controls (χ2: 7.569; DF: 3; p-value = 0.055)

**Calculated by Exact Fisher's test