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. 2009 Aug 6;4(8):e6540. doi: 10.1371/journal.pone.0006540

Table 4. Associations between reduced sperm counts and the most common MTHFR haplotypes.

Haplotype	Frequency	Cases (alleles)		Controls (alleles)		Chi²	p
		n	%	n	%
GCA	0.400	201	40.26	87	38.07	0.217	0.6410
GTA	0.290	144	28.78	65	28.33	0.0020	0.9627
GCC	0.261	127	25.48	60	26.4	0.114	0.7360
GTC	0.034	13	2.68	11	5	2.647	0.1037