Table 3. Risk-Adjusted Model of Unplanned Readmission.
| Characteristic | Base Model (Morris et al) |
Base Model + mFI, OR (95% CI) |
Base Model + mFI Components, OR (95% CI)a |
Harrell Ranking, χ2 (df) |
P Value |
|---|---|---|---|---|---|
| mFI (composite) | NA | 1.11 (1.10-1.12) | NA | NA | <.001 |
| Dependent functional status | NA | NA | 1.16 (1.11-1.21) | 41.55 | <.001 |
| CVA with residual deficit | NA | NA | 1.17 (1.11-1.22) | 37.74 | <.001 |
| Previous PCI, CABG, or angina | NA | NA | 1.11 (1.08-1.15) | 35.22 | <.001 |
| History of diabetes requiring oral or insulin therapy | NA | NA | 1.10 (1.06-1.13) | 32.39 | <.001 |
| History of COPD or pneumonia | NA | NA | 1.11 (1.07-1.15) | 30.76 | <.001 |
| Peripheral vascular disease | NA | NA | 1.13 (1.08-1.19) | 24.54 | <.001 |
| TIA or CVA without residual deficit | NA | NA | 1.16 (1.09-1.23) | 22.13 | <.001 |
| Hypertension requiring medication | NA | NA | 1.07 (1.04-1.11) | 16.51 | <.001 |
| History of congestive heart failure | NA | NA | 1.13 (1.01-1.25) | 3.59 | .03 |
| Impaired sensorium | NA | NA | 1.12 (0.99-1.27) | 2.08 | .08 |
| History of MI within 6 mo | NA | NA | 0.93 (0.81-1.06) | 0.19 | .28 |
| R2, % | 10.02 | 10.26 | 10.28 | NA | NA |
| C statistic | 0.703 | 0.705 | 0.705 | NA | NA |
Abbreviations: CABG, coronary artery bypass grafting surgery; COPD, chronic obstructive pulmonary disease; CVA, cerebrovascular accident; mFI, Modified Frailty Index; MI, myocardial infarction; NA, not applicable; PCI, percutaneous coronary intervention; TIA, transient ischemic attack.
a
The Modified Frailty Index and its components are explained in the Variables subsection of the Methods section.