Table 1.

Distribution of blood types in control and patient group

	Control Group		Patient Group		P*
	n	%	n	%
ABO Blood Type
0+	15600	30.020	142	28.862	0.573
0-	2556	4.919	12	2.439	0.008
A+	19843	38.185	187	38.008	0.936
A-	2690	5.176	23	4.675	0.601
B+	6630	12.758	71	14.431	0.293
B-	830	1.597	5	1.016	0.202
AB+	3335	6.418	44	8.943	0.126
AB-	482	0.928	8	1.626	0.222
Total	51966		492

*t-test for two independent proportions.