Figure 3. Fractalkine/CX3CL1 and IL-8/CXCL8 levels correlation with age in DED patients. Fractalkine/CX3CL1 and IL-8/CXCL8 levels correlated positively with age in evaporative-type DED tear samples. Spearman ranked correlation test was used and the strength of correlation between variables was determined by the Spearman's rho correlation coefficient. Dotted lines indicate the 95% confidence bands. IL, interleukin; OD, right eye; OS, left eye.