Table 2. Comparison of demographic and preoperative information for patients in ED readmission and ED discharge groups (N=224).
ED: emergency department, SD: standard deviation, BMI: body mass index, ASA: American Society of Anesthesiologists, TKA: total knee arthroplasty, THA: total hip arthroplasty, RRAT: readmission risk assessment tool, MRSA: methicillin-resistant Staphylococcus aureus, VTE: venous thromboembolism, N/A: not applicable
| Characteristics | ED readmission patients | ED discharged patients | p-value |
| n | 36 | 186 | N/A |
| Age (years) (mean±SD) | 65.36±8.02 | 59.52±9.13 | <0.001 |
| Sex (male %) | 30.60% | 40.90% | 0.33 |
| BMI (kg/m2, mean±SD) | 32.26±6.91 | 32.28±5.86 | 0.99 |
| Race (%) | |||
| Asian | 2.80% | 1% | 0.72 |
| African American | 58.30% | 47.30% | |
| Hispanic or Latino | 2.80% | 1.60% | |
| White | 27.80% | 24.20% | |
| Surgical site (%) | |||
| TKA | 24 (66.7%) | 136 (73.1%) | 0.56 |
| THA | 12 (33.3%) | 50 (26.9%) | |
| ASA score (%) | |||
| 1 | 0 (0%) | 0 (0%) | 0.85 |
| 2 | 14 (38.9%) | 68 (36.6%) | |
| 3 | 21 (58.3%) | 115 (61.8%) | |
| 4 | 1 (2.8%) | 3 (1.6%) | |
| Insurance status % distribution | |||
| Commercial | 26.50% | 23.80% | 0.46 |
| Medicaid | 55.90% | 45.30% | |
| Medicare | 17.60% | 30.40% | |
| Others | 0% | 0.60% | |
| Diagnosis for surgery (%) | |||
| Osteoarthritis | 91.70% | 89.80% | 0.97 |
| Length of stay (days, mean±SD) | 4.22±4.17 | 3.49±2.59 | 0.17 |
| Days since surgery (days, mean±SD) | 28.23±25.59 | 29.89±24.60 | 0.71 |
| RRAT score (% Patients) | |||
| 0 | 2.80% | 2.70% | 0.24 |
| 1 | 5.60% | 15.10% | |
| 2 | 8.30% | 16.10% | |
| 3 | 13.90% | 17.70% | |
| 4 | 22.20% | 17.70% | |
| 5 | 13.90% | 14.00% | |
| 6 | 13.90% | 7.00% | |
| 7 | 11.10% | 2.20% | |
| 8 | 5.60% | 3.80% | |
| 9 | 2.80% | 3.20% | |
| 10 | 0 | 0.50% | |
| RRAT score subcategories (mean±SD) | |||
| MRSA score | 0.50±1.13 | 0.61±1.21 | 0.61 |
| Smoking score | 0.28±0.45 | 0.32±0.47 | 0.64 |
| BMI score | 1.14±1.05 | 0.99±1.01 | 0.42 |
| Ambulatory status score | 0.64±0.54 | 0.76±0.51 | 0.18 |
| Diabetes score | 0.50±0.70 | 0.45±0.75 | 0.72 |
| Cardiovascular score | 0.33±0.48 | 0.06±0.25 | <0.001 |
| VTE score | 0.83±0.81 | 0.28±0.58 | <0.001 |
| Neurocognitive score | 0.78±1.02 | 0.15±0.49 | <0.001 |