Table 4.

Multivariate analysis of overall survival (Cox regression model)

Variable	β	Relative risk	95% Confidence interval	P valuea
Sex	0.433	0.649	0.32–1.31	0.229
Tumor size	0.206	0.814	0.399–1.659	0.82
IGFBP-3 expression	−1.328	0.265	0.130–0.541	<0.001
T category	0.933	0.393	0.206–0.750	0.005
N category	0.699	0.497	0.249–0.993	0.038
M category	0.787	0.455	0.222–0.935	0.032

^aBy χ² test