Table 4. Univariate and Multivariable Results and Model Performance for Outcomes Using Each Same-Day Procedure Category.
| Model | Observed rate Additional procedure? | Odds ratio (95% CI) | C-statistic* | Likelihood ratio test† | |
|---|---|---|---|---|---|
| No, % | Yes, % | ||||
| Mortality | |||||
| Baseline‡ | 5.0 | NA | NA | 0.840 | NA |
| Any | 1.7 | 6.2 | 2.14 (1.99–2.30) | 0.844 | 497.50§ |
| Surgical | 2.6 | 6.1 | 1.45 (1.37–1.54) | 0.842 | 175.45§ |
| Nonsurgical | 3.1 | 9.3 | 2.36 (2.26–2.46) | 0.852 | 1,587.80§ |
| Colon | 3.2 | 8.2 | 1.51 (1.44–1.57) | 0.843 | 329.25§ |
| Abdomen | 4.7 | 5.4 | 1.01 (0.97–1.06) | 0.840 | 0.46 |
| Other | 3.0 | 9.0 | 2.33 (2.23–2.43) | 0.852 | 1,545.15§ |
| No. of procedures | 0.854 | 1,778.23§ | |||
| 0 | NA | 1.5 | Ref | ||
| 1 | NA | 3.0 | 1.46 (1.34–1.59) | ||
| 2 | NA | 4.9 | 1.97 (1.81–2.15) | ||
| 3+ | NA | 10.3 | 3.60 (3.32–3.90) | ||
| Wound disruption | |||||
| Baseline‡ | 1.6 | NA | NA | 0.723 | NA |
| Any | 0.8 | 1.9 | 1.58 (1.42–1.75) | 0.726 | 76.42§ |
| Surgical | 0.9 | 1.9 | 1.40 (1.27–1.53) | 0.725 | 52.78§ |
| Nonsurgical | 1.3 | 2.3 | 1.37 (1.28–1.47) | 0.727 | 77.90§ |
| Colon | 1.2 | 2.3 | 1.37 (1.27–1.47) | 0.726 | 71.26§ |
| Abdomen | 1.4 | 1.8 | 1.12 (1.05–1.20) | 0.723 | 10.48 |
| Other | 1.3 | 2.3 | 1.44 (1.34–1.54) | 0.728 | 106.11§ |
| No. of procedures | 0.732 | 201.43§ | |||
| 0 | NA | 0.7 | Ref | ||
| 1 | NA | 1.2 | 1.26 (1.11–1.43) | ||
| 2 | NA | 1.7 | 1.56 (1.37–1.77) | ||
| 3+ | NA | 2.7 | 2.04 (1.82–2.30) | ||
| Wound infection | |||||
| Baseline‡ | 5.6 | NA | NA | 0.647 | NA |
| Any | 3.3 | 6.3 | 1.47 (1.39–1.55) | 0.652 | 212.76§ |
| Surgical | 3.6 | 6.4 | 1.40 (1.33–1.47) | 0.652 | 195.30§ |
| Nonsurgical | 4.9 | 7.1 | 1.27 (1.22–1.32) | 0.650 | 137.41§ |
| Colon | 4.7 | 7.0 | 1.22 (1.17–1.27) | 0.649 | 96.20§ |
| Abdomen | 4.5 | 6.6 | 1.32 (1.27–1.37) | 0.651 | 196.96§ |
| Other | 4.8 | 7.1 | 1.30 (1.25–1.35) | 0.651 | 173.23§ |
| No. of procedures | 0.660 | 521.39§ | |||
| 0 | NA | 3.3 | Ref | ||
| 1 | NA | 4.7 | 1.23 (1.16–1.31) | ||
| 2 | NA | 5.8 | 1.42 (1.33–1.52) | ||
| 3+ | NA | 8.4 | 1.87 (1.76–1.98) | ||
| Respiratory complications | |||||
| Baseline‡ | 12.9 | NA | NA | 0.802 | NA |
| Any | 4.9 | 15.5 | 2.20 (2.10–2.30) | 0.808 | 1,383.56§ |
| Surgical | 6.7 | 15.6 | 1.64 (1.58–1.71) | 0.805 | 737.91§ |
| Nonsurgical | 8.7 | 21.9 | 2.32 (2.26–2.39) | 0.816 | 3,408.87§ |
| Colon | 8.5 | 20.5 | 1.73 (1.68–1.78) | 0.808 | 1,342.36§ |
| Abdomen | 11.5 | 14.1 | 1.11 (1.08–1.14) | 0.802 | 51.84§ |
| Other | 8.4 | 21.3 | 2.30 (2.24–2.37) | 0.816 | 3,387.65§ |
| No. of procedures | 0.824 | 5,354.68§ | |||
| 0 | NA | 4.3 | Ref | ||
| 1 | NA | 8.0 | 1.43 (1.35–1.50) | ||
| 2 | NA | 13.2 | 2.17 (2.05–2.29) | ||
| 3± | NA | 25.1 | 4.17 (3.97–4.38) | ||
No patients fell into this category.
*
Internally validated using bootstrapping with 100 replications.
†
Comparison of model with adjustment for same-day procedures to baseline model.
‡
Model with adjustment for patient and hospital factors, but not same-day procedures.
§
p < 0.001 after correction for multiple comparisons.
NA, Not applicable.