Table 5.

Distribution of GSTT1-absent genotype in different regions across the globe.

Location (Population)	Frequency of GSTT1 Null Genotype	Reference
Africa
Tunisia (central Tunisian)	0.29	(51)
Gambia (Wollof)	0.5	(52)
South America
Mexico (Western Mexican)	0.03	(53)
Paraguay (Ache)	0.18	(54)
North America
USA (Whites)	0.3	(55)
USA (African-Americans)	0.33	(55)
Europe
Athens, Greece (Greek)	0.1	(56)
Italy (Roman)	0.33	(57)
Asia
Haifa, Israel (Druze), Kabul Afghanistan (Pushtun)	0.07	(58, 59)
Seoul, Korea (Koreans)	0.53	(60)
Oceania
Australia	0.17	(61)