Clinical feature	Statistical test	Significant variables	Associated with	               	Associated with	
DAYS_TO_DEATH_OR_LAST_FUP	Cox regression test	N=0	 	 	 	 
YEARS_TO_BIRTH	Spearman correlation test	N=2	older	N=2	younger	N=0
PATHOLOGIC_STAGE	Kruskal-Wallis test	N=1	 	 	 	 
PATHOLOGY_T_STAGE	Spearman correlation test	N=1	higher stage	N=1	lower stage	N=0
PATHOLOGY_N_STAGE	Wilcoxon test	N=0	 	 	 	 
PATHOLOGY_M_STAGE	Wilcoxon test	N=0	 	 	 	 
GENDER	Wilcoxon test	N=0	 	 	 	 
RADIATION_THERAPY	Wilcoxon test	N=0	 	 	 	 
HISTOLOGICAL_TYPE	Kruskal-Wallis test	N=3	 	 	 	 
RADIATION_EXPOSURE	Wilcoxon test	N=0	 	 	 	 
EXTRATHYROIDAL_EXTENSION	Kruskal-Wallis test	N=2	 	 	 	 
RESIDUAL_TUMOR	Kruskal-Wallis test	N=0	 	 	 	 
NUMBER_OF_LYMPH_NODES	Spearman correlation test	N=0	 	 	 	 
MULTIFOCALITY	Wilcoxon test	N=0	 	 	 	 
TUMOR_SIZE	Spearman correlation test	N=1	higher tumor_size	N=1	lower tumor_size	N=0
RACE	Kruskal-Wallis test	N=0	 	 	 	 
ETHNICITY	Wilcoxon test	N=0