Table 5. Multivariate analysis.

Prognostic factor	Hazard ratio	95% confidence interval	P-value
Age at diagnosisa	1.018	1.016–1.019	P<0.005
Year of diagnosisb	0.977	0.970–0.984	P<0.005
Stagec	1.266	1.220–1.315	P<0.005
Graded	1.933	1.684–2.219	P<0.005
Histologye	1.994	1.716–2.316	P<0.005
Extent of lymphadenectomyf	0.911	0.861–0.964	P=0.001
Positive nodesg	1.338	1.215–1.473	P<0.005

^aContinous.

^bContinous.

^cStage IIIA/B vs IIIC vs IV.

^dGrade 1 vs 2–3.

^eOthers vs clear cell.

^f0 vs 1 vs 2–5 vs 6–10 vs ⩾11.

^gNo vs yes.