Table 3.

Multivariate Cox proportional hazards regression

		N = 100
		HR	95% CI	P‐value
Gender	Male	REF
	Female	0.49	0.13–1.9	0.30
Insurance status	Public	REF
	Private	1.4	0.38–5.1	0.61
	None	3.8	0.23–62	0.36
	Unknown	4.3	0.31–61	0.28
Income	<$63,000	REF
	≥$63,000	0.47	0.06–4.0	0.50
	Unknown	–	–	–
Tumor size	<15 cm	REF
	≥15 cm	8.1	1.3–48	0.02
	Unknown	4.7	1.0–22	0.05
Treatment modality	Chemotherapy only	REF
	No treatment	2.2	0.25–19	0.49
	Surgery only	–	–	–
	Combined therapy	0.03	0.004–0.27	<0.01
	Unknown	–	–	–
Margins of resection	Negative	REF
	Positive	5.7	0.96–37	0.07
	Not applicable	–	–	–
	Unknown	1.3	0.10–17	0.86

REF, reference variable; HR, hazard ratio; CI, confidence interval; “–”, insufficient cases for analysis. P values <0.05 are shown in bold.