| Univariate analysis | Multivariate analysis | ||||
---|---|---|---|---|---|---|
 | HR | 95% CI | P value | HR | 95% CI | P value |
Days of hospitalization | Reference | Â | Â | Reference | Â | Â |
Age | 2.957 | 2.125–3.674 | 0.042 | 2.845 | 2.147–3.876 | 0.059 |
Serum albumin | 6.248 | 4.856–8.584 | < 0.001 | 7.134 | 5.034–9.014 | < 0.001 |
BMI at admission | 1.568 | 1.241–1.958 | 0.576 |  |  |  |
BMI after surgery | 1.638 | 1.148–1.974 | 0.423 |  |  |  |
NRI at admission | 2.587 | 1.845–2.936 | 0.033 | 2.668 | 1.954–3.547 | 0.036 |