Fig. 3

Kaplan-Meier curves for cumulative survival according to perioperative changes of PNI. PNI: prognostic nutrition index; Group HH: high preoperative PNI and high postoperative PNI (solid line); Group LH: low preoperative PNI and high postoperative PNI (long dashed line); Group HL; high preoperative PNI and low postoperative PNI (short dashed line); Group LL: low preoperative PNI and low postoperative PNI (dotted line). Because Bonferroni correction of the alpha value was performed to compensate multiple comparisons, a p-value < 0.008 (0.05/6) was considered statistically significant