Table 5.

Child birthweight and maternal ABO blood type for selected groups

Group	Blood type	No.	Mean birthweight (g)	ANOVA P value	t-test P value
All children	A	77	3,260	0.026
	B	28	2,894
	AB	17	2,870
	O	96	3,090
	A	77	3,260		0.003
	Non-A†	141	3,022
Child sex
Male	A	38	3,217		0.458
	Non-A	54	3,124
Female	A	39	3,385		<0.001
	Non-A	87	3,029
Child lesion level
Upper	A	42	3,337		0.202
	Non-A	48	3,189
Lower	A	35	3,260		0.023
	Non-A	93	3,002

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