Table 2.
Univariate analysis of variables assessed for association with 30-day readmission for the 2010 derivation cohort (n = 8,700).****
| Not Readmitted | Readmitted | Statistics | |||||
|---|---|---|---|---|---|---|---|
| n | % | n | % | OR | 95% CI** | P-value | |
| Acute Admission (i.e., not scheduled)** 66% (5734/8700) | 4746 | 83 | 988 | 17 | 2.3 | 2.0–2.7 | <0.0001 |
|
Age*** Mean = 60.6 (Std = 20.6) |
Mean | Std | Mean | Std | Mean Dif. | Std Error*** | P-value |
| 59.7 | 20.9 | 66.1 | 17.0 | -6.4 | 0.63 | <0.0001 | |
| Male Sex** 39% (3404/8700) | n | % | n | % | OR | 95% CI** | P-value |
| 2828 | 83 | 576 | 16.9 | 1.4 | 1.3–1.6 | <0.0001 | |
|
Married** 50% (4304/8700) |
n | % | n | % | OR | 95% CI** | P-value |
| 3777 | 88 | 527 | 12 | 0.73 | 0.65-0.83 | <0.0001 | |
| ED Visits within one year* | n | % | n | % | Chi-Square* | P-value | |
| • 0 | 4024 | 53.9 | 452 | 36.7 | 236.0 | <0.0001 | |
| • 1–2 | 2232 | 29.9 | 379 | 30.8 | |||
| • 3–5 | 780 | 10.4 | 210 | 17.1 | |||
| • ≥6 | 434 | 5.8 | 189 | 15.4 | |||
| Inpatient Visits within one year* | n | % | n | % | Chi-Square* | P-value | |
| • 0 | 4451 | 59.6 | 484 | 39.3 | 312.4 | <0.0001 | |
| • 1–2 | 2223 | 29.8 | 418 | 34.0 | |||
| • 3–5 | 649 | 8.7 | 237 | 19.3 | |||
| • ≥6 | 147 | 2.0 | 91 | 7.4 | |||
| Uninsured** 7%(645/8700) | n | % | n | % | OR | 95% CI** | P-value |
| 546 | 85 | 99 | 15 | 1.2 | 0.89–1.4 | 0.35 | |
| Lives alone** 9% (783/8700) | n | % | n | % | OR | 95% CI** | P-value |
| 641 | 18 | 641 | 82 | 1.4 | 1.1–1.7 | 0.001 | |
| Length of Stay* | n | % | n | % | Chi-square* | P-value | |
| • 0–1 | 1442 | 19.3 | 199 | 16.2 | 127.5 | <0.0001 | |
| • 2–3 | 3893 | 52.1 | 490 | 39.8 | |||
| • 4–8 | 1804 | 24.1 | 432 | 35.1 | |||
| • ≥9 | 331 | 4.5 | 109 | 8.9 | |||
| Medications on the Patient’s Inpatient Medication List Two Days Prior to Discharge*** 14.0 (5.9), 0–55 | Mean | Std. | Mean | Std. | Mean Dif. | Std error*** | P-value |
| 13.6 | 5.8 | 16.2 | 6.3 | -2.5 | 0.18 | <0.0001 | |
| Medications on the Patient’s Ambulatory Medication List* | n | % | n | % | Chi-square* | P-value | |
| • 0–1 | 3150 | 42.2 | 511 | 41.5 | 1.581 | 0.67 | |
| • 2–5 | 2138 | 28.6 | 359 | 29.2 | |||
| • 6–14 | 1755 | 23.5 | 280 | 22.8 | |||
| • ≥15 | 427 | 5.7 | 80 | 6.5 | |||
|
Modified Charlson Comorbidity Index* |
n | % | n | % | Chi-square* | P-value | |
| • 0–3 | 3203 | 42.9 | 202 | 16.4 | 311.4 | <0.0001 | |
| • 4–8 | 2795 | 37.4 | 658 | 53.5 | |||
| • ≥9 | 1472 | 19.7 | 370 | 30.1 | |||
**** Statistical comparisons based on readmission for categorical variables were assessed using Fisher’s Exact Test 2×2 with Odd Ratios with 95 percent confidence interval and Pearson’s Chi Square for all other categorical predictors. Continuous variables were reported with a mean difference with standard error of the difference and assessed using a Student’s t-test.