Table 2.

Univariate and multivariate logistic regression analysis in the training cohort

Variables		Univariate analysis		Multivariate analysis
		OR (95%CI)	P value	OR (95%CI)	P value
Age			0.001		0.027
	<20	Reference		Reference
	20–49	0.38 (0.21, 0.66)	<0.001	0.45 (0.24, 0.84)	0.012
	≥50	0.62 (0.35, 1.12)	0.114	0.58 (0.27, 1.26)	0.169
Sex			0.547
	Male	Reference
	Female	0.87 (0.56, 1.36)	0.547
Race			0.902
	White	Reference
	Black	1.03 (0.58, 1.84)	0.909
	Other	0.66 (0.27, 1.61)	0.363
Primary site			<0.001		0.019
	External	Reference		Reference
	Axial	0.81 (0.42, 1.57)	0.527	0.44 (0.18, 1.05)	0.065
	Other	0.12 (0.03, 0.49)	0.003	0.2 (0.04, 0.94)	0.041
Size			<0.001
	<5	Reference
	5–10	3.15 (1.08, 9.16)	0.035
	≥10	5.22 (1.83, 14.84)	0.002
Grade			<0.001		0.032
	High	Reference		Reference
	Low	7.72 (1.86, 32.01)	0.005	3.8 (0.88, 16.3)	0.073
T			<0.001		0.027
	T1	Reference		Reference
	T2	2.81 (1.65, 4.76)	<0.001	1.92 (1.09, 3.4)	0.024
	T3	8.7 (2.75, 27.55)	<0.001	3.72 (1.03, 13.47)	0.045
Surgery			<0.001		<0.001
	No	Reference		Reference
	Yes	0.19 (0.11, 0.34)	<0.001	0.12 (0.05, 0.25)	<0.001