Table 5.

The haplogroup defining SNP (A12308G) and the T195C allele in D-Loop region were tested in a post hoc analysis using a Cochran–Mantel–Haenszel (CMH) test for repeated 2 × 2 tests of independence.

mtDNA allele		Group
12308	195	Control (n)	SZ (n)	BD (n)
A	T	2600	761	629
	C	417	82	81
G	T	701	193	180
	C	168	37	40
	Total N	3886	1073	930
	CMH		10.62	2.69
	df		2	2
	CMH p-value		0.0011	0.1007

The results for SZ remained significant (p = 0.0011) while combined results of SZ and BD were also significant (not shown, p = 0.001).