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Restricted cubic spline plot for IL-6 and risk of colorectal cancer. Relative risk (RR) of colorectal cancer is plotted according to plasma IL-6 (pg/mL). Hatched lines represent 95% confidence intervals (CI). Spline was adjusted for the same factors as the multivariate model in Table 3. A test for overall significance of the curve was non-significant (p=0.49).
