Association Study of Estrogen Receptor Alpha Gene Polymorphisms with Spontaneous Abortion: Is This a Possible Reason for Unexplained Spontaneous Abortion?

Table 1

Haplotype frequencies of PvuII and XbaI polymorphisms in healthy and spontaneous abortion groups.

Group	Genotypes, 𝑛 (%)
	ppxx	Other combined genotypes
Spontaneous abortion	12 (15.0%)	68 (85.0%)
Healthy	25 (30.9%)*	56 (69.1%)

^∗𝑃=0.01 (𝑃 value, two-sided, from 𝜒² test).