Table 5.

Definition of the scoring system.

	Point*
	0	1	2
History of smoking	Non-smokers	Smokers
PS score	0		1
PLT	Normal	Elevated
LDH	Normal	Elevated

Fg – fibrinogen; PLT – platelet; LDH – lactate dehydrogenase.

^*Coefficient estimates (i.e. logarithm of HR) were ‘normalized’ by dividing by the smallest one and rounding the resulting ratios to the nearest integer value.