Table 2.

Comparison of clinical features between the case and control groups

Variable	Case	Control	P value
No. (n)	168	216
Female [n (%)]	70 (41.67)	82 (37.96)	0.462
Age (years)	20.09 ± 9.32	20.53 ± 11.79	0.737
BMI (kg/m2)	22.07 ± 1.87	21.89 ± 1.86	0.262
Tumor metastasis [n (%)]	34 (20.24)
Enneking stages [n (%)]
I	25 (14.88)
II	120 (71.43)
III	23 (13.69)
Location [n (%)]
Trunk	17 (10.12)
Limbs	151 (89.88)