Table 2.

Univariate and multivariate analyses results of risk factors associated with overall survival.

Variables	Univariate HR (95% CI)	Univariate P-value	Multivariate HR (95% CI)	Multivariate P-value
Age, y*	1.02 (1.00, 1.04)	0.056	1.02 (1.00, 1.05)	0.07
Male gender	1.54 (0.90, 2.61)	0.113	1.03 (0.54, 1.96)	0.93
Positive lymph node	6.82 (3.72, 12.53)	<0.0001	7.55 (3.34, 17.05)	<0.0001
Ulceration	1.85 (1.06, 3.22)	0.03	0.64 (0.30, 1.36)	0.25
Thickness, mm*	1.11 (1.05, 1.17)	0.0001	1.08 (1.01, 1.16)	0.034
Stress-bearing area	1.38 (0.41, 4.59)	0.603	1.25 (0.37, 4.25)	0.72

CI, confidence intervals; HR, hazard ratio.

^*Continuous variables.