Figure 1.

The IL-6 polymorphism (genotype and alleles frequencies) in swimmers and controls.

¹χ² = 7.56, d.f. = 1, p < 0.01 for CC genotype frequency in controls vs. long distance swimmers.

²χ² = 3.91, d.f. = 1, p < 0.05 for CC genotype frequency in long distance swimmers vs. short distance swimmers

³χ² = 18.24, d.f. = 1, p < 0.001 for allele frequency in controls vs. long distance swimmers.

⁴χ² = 4.26, d.f. = 1, p < 0.05 for allele frequency in long distance swimmers vs. short distance swimmers