Table 2. Factors associated with receipt of surgical resection of the primary tumor.

Variables			Univariate model		Multivariate model
		OR	(95% CI)	P	OR	(95% CI)	P
Gender	Male	1(Referent)			1(Referent)
	Female	1.272	0.651–2.486	0.482	1.756	0.627–4.918	0.284
Age (years)	< 65	1(Referent)			1(Referent)
	≥ 65	0.328	0.152–0.711	0.005	0.602	0.200–1.817	0.368
Race	White	1(Referent)			1(Referent)
	Other	0.434	0.158–1.19	0.105	0.305	0.065–1.441	0.134
Marital status	Married	1(Referent)			1(Referent)
	Other	0.854	0.423–1.721	0.658	0.704	0.234–2.115	0.532
	Unknown	0.628	0.128–3.08	0.567	0.577	0.062–5.405	0.63
Tumor location	Head	1(Referent)			1(Referent)
	Body and Tail	1.532	0.693–3.383	0.292	1.763	0.550–5.650	0.34
	Overlapping	1.22	0.365–4.079	0.747	1.049	0.168–6.563	0.959
	Other	0.441	0.13–1.499	0.19	1.028	0.188–5.615	0.974
Histological grade	Well	1(Referent)			1(Referent)
	Moderate	1.591	0.652–3.884	0.308	1.08	0.308–3.785	0.905
	Poor	1.591	0.413–6.133	0.5	1.158	0.214–6.267	0.865
	Unknown	0.089	0.031–0.255	< 0.001	0.069	0.019-.255	< 0.001
T stage	T0–T2	1(Referent)			1(Referent)
	T3–T4	3.71	1.716–8.021	0.001	1.891	0.648–5.518	0.244
	Tx	0.098	0.012–0.778	0.028	0.08	0.007–0.926	0.043
N stage	N0	1(Referent)			1(Referent)
	N1	5.42	2.607–11.27	< 0.001	7.428	2.529–21.820	< 0.001
	Nx	None			None