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Table 3 Results of POSSUM Mortality calculation (R1) compared to observed mortality (outcome 4) and to the rate of severe morbidity and death (outcome 3 +4) in 137 patients with gastrectomy and D2-lymphadenectomy.

From: Evaluation of POSSUM scoring system in patients with gastric cancer undergoing D2-gastrectomy

  Possum Mortality Risk (R1) patients expected death observed death outcome = 4 Observed morbidity and death outcome = 3+4
  (%) n n n % n %
  0–10 21 1 0 0 3 14,3
  38675 51 7 1 2,0 7 13,7
low risk 0 – 20 72   1 1, 0 10 13, 9
  21–30 38 9 3 7,8 9 23,7
  31–40 19 6 2 10,5 4 21,1
med risk 21–40 57   5 8, 8 13 22, 8
  41–60 4 1 1 25,0 1 25,0
  71–100 4 2 1 25,0 3 75,0
high risk > 40 8   2 25, 0 4 50, 0
total   137 29 8   27