Table 4. New prognostic index score and risk groups.

Factor	Score	β (hazard ratio=e β )a
Haemoglobin level (<12 g dl−1)	4	0.73
Performance status (ECOG ⩾2b)	5	0.95
Disease-free interval
Metastasis at diagnosis	1	0.19
⩽6 months	10	2.04
Maximum score	19

Low risk: score 0–3; intermediate risk: score 4–8; high risk: score ⩾9.

^aβ=Regression Coefficient.

^bECOG refers to performance status as defined by the Eastern Cooperative Oncology Group.