Table 2.

Frequencies of SOD2 and SOD3 genotypes in cases and controls.

	Cases (n = 258)		Controls (n = 261)
SOD2 genotype	n	%	n	%	χ2	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	%	χ2	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.