Table 3. Haplotype frequencies for the GSTT1 and GSTT2B deletion polymorphisms in Black and Mixed Ancestry populations.

Population	Haplotype	Control Frequency		Linkage Disequilibrium
	GSTT1 – GSTT2B	Obs	Exp	r2	D′	OR	p-value
Black				0.04	0.27
	Wt – Wt	0.2268	20.21			1 (reference)	-
	DEL – Wt	0.4004	d0.35			1.000 (0.74–1.36)	1.0000
	Wt – DEL	0.2223	e0.165			0.814 (0.56–1.18)	0.2796
	DEL – DEL	0.1505	30.28			0.912 (0.65–1.29)	0.6006
Mixed Ancestry				0.07	0.33
	Wt – Wt	0.1711	0.25			1 (reference)	-
	DEL – Wt	0.3313	0.25			0.766 (0.52–1.12)	0.1705
	Wt – DEL	0.3337	0.25			0.584 (0.39–0.87)	0.0078
	DEL – DEL	0.1639	0.25			0.583 (0.39–0.88)	0.0083

p-value is for comparing each haplotype to the reference Wt-Wt haplotype.