| Univariate analysis | Multivariate analysis | ||||
---|---|---|---|---|---|---|
 | HR | 95% CI | P value | HR | 95% CI | P value |
Days of hospitalization | Reference | Â | Â | Reference | Â | Â |
Age | 3.065 | 1.948–4.129 | 0.041 | 3.415 | 2.477–4.025 | 0.037 |
Serum albumin | 7.589 | 5.287–9.046 | < 0.001 | 8.147 | 6.245–9.898 | < 0.001 |
BMI at admission | 1.258 | 1.005–1.429 | 0.225 |  |  |  |
BMI after surgery | 1.345 | 1.059–1.593 | 0.397 |  |  |  |
NRI at admission | 1.979 | 1.589–2.343 | 0.035 | 2.041 | 1.426–2.846 | 0.037 |