Levene test of variables for homogeneity of variance.

Note: variables include diameter of GGO nodules, total volume (TV), the maximum CT number (MAX), average CT number (AVG), standard deviation of CT number within the whole GGO nodule (STD), Ki-67 labeling index (LI) and prediction value of Ki-67 LI from multi-linear regression model. p (Sig.)<0.05 means variance are heterogeneous, p (Sig.)>0.05 means variance are homogeneous. Variance of Diameter, TV, MAX, AVG, STD and Prediction were heterogeneous, which means they all would be tested by Tamhane’s T2 test. As for homogeneous variance, Ki-67 LI would be tested by Least Significant Difference (LSD) test for significant difference among groups. Levene test of variables for homogeneity of variance.