Multivariable logistic regression analysis of factors associated with long LOS (highest quartile, ≥16 days)
| Variable | OR for long LOS | 95% CI | P value |
| Delirium | 4.81 | 1.59 to 14.47 | 0.005 |
| Any (non-delirium) complication* | 5.96 | 2.09 to 16.97 | 0.001 |
Frailty was included in an earlier multivariable analysis (as was not strongly associated with delirium (correlation coefficient 0.44), as per the a priori statistical plan, but excluded from the final model as it did not meet statistical significance.
*From selected in-hospital complications (see text).
LOS, length of stay.