Manganese and Extracellular Superoxide Dismutase Polymorphisms and Risk for Asbestosis

Table 2

Frequencies of SOD2 and SOD3 genotypes in cases and controls.

	Cases (𝑛=258)		Controls (𝑛=261)
SOD2 genotype	n	%	n	%	𝜒^2	P-value
Ala/Ala	75	29.0	56	21.4
Ala/Val	116	45.0	139	53.3	4.79*	.029
Val/Val	67	26.0	66	25.3	1.25^†	.263
Ala/Val + Val/Val	183	71.0	205	78.6	3.99^‡	.046
	Cases (𝑛=258)		Controls (𝑛=263)
SOD3 genotype	n	%	n	%	𝜒^2	P-value
Arg/Arg	247	95.7	256	97.3
Arg/Gly	11	4.3	7	2.7	1.00^§	.317
Gly/Gly	0	0	0	0

* 𝜒² calculated for Ala/Ala versus Ala/Val ^†𝜒² calculated for Ala/Ala versus Val/Val ^‡𝜒² calculated for Ala/Ala versus Ala/Val + Val/Val ^§𝜒² calculated for Arg/Arg versus Arg/Gly.