Table 2.

Child sex and maternal ABO blood type

Blood type	Child sex		Chi-squared P value	Odds ratio	Odds ratio 95% CI
	Male	Female
A	38	40	0.509
B	12	17
AB	7	11
O	36	60
A	38	40		1.52	0.8705–2.654
Non-A†	55	88

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