Table 2.

Univariate and multivariate analysis in the training cohort.

Variables	Univariate analysis p value		Multivariate analysis		Selected factors for building nomogram
	P	OR	95% CI	P	OR	95% CI	P
Age (years)	0.002
≤ 70		1 (reference)			1 (reference)
> 70		0.591	0.433-0.805	0.001	0.591	0.433-0.805	0.001
Sex	0.553
Male
Female
Race	0.087
White
Black
Othersa
Marital status	0.499
Married
Unmarriedb
Grade	< 0.001
I		1 (reference)
II		2.988	1.669-5.348	< 0.001	2.988	1.669-5.348	< 0.001
III		4.800	2.655-8.646	< 0.001	4.800	2.655-8.646	< 0.001
IV		5.573	2.004-15.498	0.001	5.573	2.004-15.498	0.001
Unknow		9.562	136 (59.4%)	< 0.001
Histology	< 0.001
Adenocarcinoma		1 (reference)
Othersc		1.521	1.061-2.180	0.023	1.521	1.061-2.180	0.023
T stage	0.002
T1		1 (reference)
T2		0.747	0.565-0.987	0.04	0.747	0.565-0.987	0.04
N stage	< 0.001
N0		1 (reference)
N1		3.024	2.323-3.938	< 0.001	3.024	2.323-3.938	< 0.001
Tumor size	< 0.001
< 2		1 (reference)
≥ 2		1.578	1.160-2.148	0.004	1.578	1.160-2.148	0.004
Unknow		2.232	1.428-3.488	< 0.001

Data expressed as a number (%). ^aIncludes: American Indian/native Alaskan and Asian/Pacific Islander; ^bIncludes: divorced, separated, single, domestic partner and widowed; ^cIncludes: epithelial neoplasms, cystic, mucinous and serous neoplasms, squamous cell neoplasms.