Appendix Table 3.
Adjusted 30-Day Readmission Rates, by Patient Characteristics, in Medicare Enrollees With a PCP Who Were Discharged Between 1 January 2012 and 30 November 2015, Estimated From a Multilevel Logistic Regression Model (PROC GLIMMIX) Adjusted by Patient Characteristics (n = 565 579)*
| Patient Characteristic | Patients, n (%) | Odds Ratio (95% CI)† | Adjusted 30-Day Readmission Rate (95% CI), %† | |
|---|---|---|---|---|
| Age | ||||
| 66–70 y | 110 806 (19.6) | 1.00 (reference) | 11.0 (10.8–11.3) | |
| 71–75 y | 120 348 (21.3) | 1.02 (0.99–1.05) | 11.2 (11.0–11.4) | |
| 76–80 y | 117 894 (20.8) | 1.10 (1.06–1.13) | 12.0 (11.7–12.2) | |
| 81–85 y | 105 702 (18.7) | 1.14 (1.11–1.18) | 12.4 (12.2–12.7) | |
| ≥86 y | 110 829 (19.6) | 1.22 (1.18–1.26) | 13.1 (12.9–13.4) | |
| Race | ||||
| Non-Hispanic white | 426 316 (75.4) | 1.00 (reference) | 12.0 (11.9–12.2) | |
| Black | 38 878 (6.9) | 0.99 (0.96–1.04) | 12.0 (11.6–12.4) | |
| Hispanic | 91 731 (16.2) | 0.94 (0.91–0.97) | 11.4 (11.1–11.6) | |
| Other | 10 654 (1.9) | 0.95 (0.89–1.01) | 11.5 (10.8–12.1) | |
| Sex | ||||
| Female | 339 944 (60.1) | 1.00 (reference) | 11.7 (11.5–11.9) | |
| Male | 225 635 (39.9) | 1.05 (1.03–1.07) | 12.2 (12.0–12.4) | |
| Medicaid-eligible | ||||
| No | 466 580 (82.5) | 1.00 (reference) | 11.7 (11.6–11.9) | |
| Yes | 98 999 (17.5) | 1.09 (1.06–1.12) | 12.7 (12.4–13.0) | |
| Percentage of persons aged ≥25 y with high school education or higher in the ZIP code of residence | ||||
| 1st quartile | 142 745 (25.2) | 1.00 (reference) | 11.9 (11.7–12.1) | |
| 2nd quartile | 140 365 (24.8) | 1.03 (1.01–1.06) | 12.2 (12.0–12.5) | |
| 3rd quartile | 142 798 (25.2) | 0.99 (0.97–1.02) | 11.9 (11.6–12.1) | |
| 4th quartile | 139 671 (24.7) | 0.97 (0.94–0.99) | 11.6 (11.4–11.8) | |
| Emergency admission | ||||
| No | 236 106 (41.7) | 1.00 (reference) | 11.3 (11.1–11.4) | |
| Yes | 329 473 (58.3) | 1.12 (1.09–1.14) | 12.4 (12.2–12.6) | |
| Weekend admission | ||||
| No | 432 890 (76.5) | 1.00 (reference) | 11.9 (11.7–12.0) | |
| Yes | 132 689 (23.5) | 1.02 (1.01–1.04) | 12.1 (11.8–12.3) | |
| Nursing home residence | ||||
| No | 541 869 (95.8) | 1.00 (reference) | 11.9 (11.7–12.0) | |
| Yes | 23 710 (4.2) | 1.07 (1.03–1.11) | 12.6 (12.2–13.1) | |
| Mean (SD) | Median (IQR) | Odds Ratio (95% CI)†‡ | Adjusted 30-Day Readmission Rate (95% CI), %†§ | |
| DRG weight | 1.6 (1.3) | 1.1 (0.8–2.0) | 1.06 (1.05–1.07) | 11.6 (11.5–11.8) |
| Hospitalizations in the prior year | 0.4 (0.9) | 0 (0–0) | 1.10 (1.09–1.11) | 11.5 (11.3–11.6) |
| Physician visits in the prior year | 13.4 (8.6) | 11 (7–17) | 1.07 (1.05–1.08) | 11.8 (11.6–11.9) |
DRG = diagnosis-related group; IQR = interquartile range; PCP = primary care physician.
Odds ratios generated from the same model are also presented. Percentages may not sum to 100 due to rounding.
Estimated from a multilevel model with patient characteristics presented in the table, plus major diagnostic category and 31 Elixhauser comorbidity indicators entered individually.
Per 1 DRG unit, 1 hospitalization, or 10 physician visits.
Calculated at the median point for continuous variables.