Table 2.

International Prognostic Index

Characteristic	0	1
Age, yrs	60	> 60
Serum LDH	1 × normal	> 1 × normal
Performance status	0 or 1	2–4
Stage	I or II	III or IV

Taken from the International Non-Hodgkin’s Lymphoma Prognostic Factors Project.¹⁸ LDH = lactate dehydrogenase.