Table 2.

Frequency of CYP1A1 and GSTs null genotypes in certain African populations.

Population	n	GSTM1 null frequency	n	GSTT1 null frequency	Reference
Africans	114	0.330	114	0.250	Dandara et al. (2002)
Africans	479	0.267			Garte et al. (2001)
Egypt	200	0.555	200	0.295	Hamdy et al. (2003)
Gambia	337	0.202	326	0.371	Wild et al. (2000)
Ivory Coast	133	0.361	133	0.331	Present study
Tunisia	79	0.456	79	0.443	Ouerhani et al. (2006)
Population	n	Ile allele frequency			Reference
Africans	114	114	0.987		Dandara et al. (2002)
Africans	445	445	0.993		Garte et al. (2001)
African-Americans	290	290	0.969		Taioli et al. (1998)
African-Americans	539	539	0.970		Garte (1998)
African-Brazilians	231	231	0.855		Gaspar et al. (2002)
African-Brazilians	21	21	0.905		Hamada et al. (1995)
Benin	94	94	1.000		Jiang et al. (2005)
Ivory Coast	133	133	0.617		Present Study
Mali	116	116	1.000		Garte (1998)
Zimbabwe	225	225	1.000		Masimirembwa et al. (1998)

n = number of tested individuals.