Proposal of a new and simple staging system of colorectal liver metastasis

Table 2 Regression statistics for the stepwise cox proportional hazard model¹

Variable	Parameter	P	Hazard Ratio (95% CI)
Diameter > 5 cm	1.35657	0.0013	3.883 (1.703-8.852)
Extrahep. Met (+).	1.19430	0.0133	3.301 (1.282-8.502)
Number ≥ 2	0.85412	0.0265	2.349 (1.105-4.997)
D.F.interval < 1 yr	0.67838	0.1602	1.971 (0.765-5.080)
n (+) of primary	0.60034	0.1352	1.823 (0.829-4.007)
≥ se (+) of primary	0.54877	0.1676	1.731 (0.794-3.774)

¹Only those variables selected by the stepwise analysis, at the P-value of 0.20 level of significance, are shown. n = 81 (Tokyo Univ. 1981-1997). Age ≥ 60, gender, synchronous, bilobar invasion, CEA; P > 0.2.