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Association between the CHI3L1 g.-131(C > G) polymorphism and age adjusted serum concentrations of YKL-40. Box plot illustrating the association in 238 patients with rheumatoid arthritis (RA) ≤ 65 years of age (P < 2.0e-16 and 605 healthy controls (P < 1.1e-8). The x-axis represents CHI3L1 g.-131(C > G) genotypes. The y-axis represents serum YKL-40, horizontal bars represents median serum YKL-40 and quartiles for patients with RA and controls.
