Table 2.
Model development and multivariable regression coefficients after shrinkage.
| Demographic Model | Geriatric Model | |
|---|---|---|
| Predictors | Beta a | Beta a |
| Cohort model estimates | ||
| Intercept | −6.64 | −2.64 |
| Age (for every 10 years) | 0.14 | 0.04 |
| Male gender | 0.26 | 0.32 |
| BMI, kg/m2 | – | – |
| History of abdominal surgery | – | – |
| Cardiac comorbidity | – | – |
| COPD/asthma/emphysema | 0.27 | 0.34 |
| Previous PE or DVT b | 0.37 | 0.35 |
| ASA score | 0.2 | 0.02 |
| Rectal tumour | 0.03 | 0.12 |
| Tumour stage | * | – |
| Reported falls | * | – |
| Risk for malnutrition | * | – |
| Previous delirium | * | 0.33 |
| Self-reported cognitive impairment | * | 0.09 |
| Self-reported need for ADL assistance | * | 0.16 |
| Mobility aid | * | 0.43 |
| Polypharmacy (≥5) | * | 0.35 |
| Model performance (AUC) | ||
| Model after bootstrapping | 0.648 | 0.687 |
| Optimism corrected model | 0.623 | 0.650 |
a Regression coefficient after shrinkage using LASSO. – candidate predictor was not selected after shrinkage. * candidate predictor was not used in model development. b PE, Pulmonary Embolism; DVT, Deep Venous Thrombosis.