A Nonlinear Association between Tongue Fur Thickness and Tumor Marker Abnormality: A Cross-Sectional Study

Figure 3

Multivariable-adjusted smoothing spline plots of abnormal tumor marker rate by tongue fur thickness. Red lines represent the spline plots and blue lines represent the 95% confidence intervals (CI) of the spline plots. Adjusted for gender, age, BMI, smoking history, drinking history, tongue color, the form of the tongue, and fur color.