Table 4.
Factors affecting 30-day readmission on cox proportional hazard multivariate analysis.
| Variables | Adjusted Odds Ratio | 95% CI | p value |
|---|---|---|---|
| Age (continuous) | 1.01 | 1.00–1.01 | <0.001 |
| Age (categorical) | |||
| <18 years | Reference | ||
| 18–30 years | 2.02 | 1.81–2.25 | <0.001 |
| 31–40 years | 1.90 | 1.70–2.11 | <0.001 |
| >40 years | 1.54 | 1.36–1.74 | <0.001 |
| Insurance type | |||
| Medicare | Reference | ||
| Medicaid | 1.02 | 0.96–1.09 | 0.54 |
| Private | 0.79 | 0.72–0.87 | <0.001 |
| Uninsured | 0.65 | 0.54–0.79 | <0.001 |
| Charlson comorbidity score | |||
| 0 | Reference | ||
| 1 | 1.16 | 1.1–1.23 | <0.001 |
| 2 | 1.26 | 1.14–1.40 | <0.001 |
| ≥3 | 1.42 | 1.25–1.60 | <0.001 |
| Median income in the patient’s zip code | |||
| ≤$38,999 | Reference | ||
| $39,000-$47,999 | 0.97 | 0.89–1.05 | 0.39 |
| $48,000–$62,999 | 0.89 | 0.81–0.97 | 0.01 |
| ≥$63000 | 0.84 | 0.75–0.94 | <0.001 |
| Hospital location | |||
| Rural | Reference | ||
| Urban | 0.88 | 0.76–1.01 | 0.08 |
| Ventilatory support | |||
| No | Reference | ||
| Yes | 0.44 | 0.26–0.74 | <0.001 |
| Length of stay (continuous) | 1.01 | 1.00–1.01 | 0.21 |
| Teaching hospital | |||
| No | Reference | ||
| Yes | 1.04 | 0.91–1.19 | 0.59 |
| Hospital volume quintiles | |||
| 1(lowest) | Reference | ||
| 2 | 1.30 | 0.94–1.79 | 0.11 |
| 3 | 1.50 | 1.12–2.02 | 0.01 |
| 4 | 1.57 | 1.18–2.10 | <0.01 |
| 5 (highest) | 1.66 | 1.25–2.21 | <0.01 |
| Discharge against medical advice | 1.72 | 1.50–1.97 | <0.001 |