Table 3.

POSSUM formulas for morbidity and mortality¹⁵

Morbidity	ln R / (1 - R) = -5.91 + (0.16 x physiological score) + (0.19 x operative score)
Mortality	ln R / (1 - R) = -7.04 + (0.13 x physiological score) + (0.16 x operative score)