Table 4.

Lesion level and maternal ABO blood type for all children and child sex

Group	Blood type	Child lesion level		Chi-squared P value	Odds ratio	Odds ratio 95% CI
		Upper	Lower
All children	A	43	35	0.011
	B	7	22
	AB	7	11
	O	34	62
	A	43	35		2.4315	1.3816–4.2795
	Non-A†	48	95
Child sex
Male	A	19	19		1.8947	0.8143–4.409
	Non-A	19	36
Female	A	24	16		3.0517	1.4086–6.6117
	Non-A	29	59

^†Non-A consists of blood types B, AB, and O