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.)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.