Table 4.
Results of multivariate analysis of risk factors for complicated hospitalization
| Without RDW | With RDW | RDW and abnormal WBC | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| % from Total | Coef. | P value | Adjusted odds ratio | 95% confidence interval | Coef. | P value | Adjusted odds ratio | 95% confidence interval | Coef. | P value | Adjusted odds ratio | 95% confidence interval | ||||
| Lower | Upper | Lower | Upper | Lower | Upper | |||||||||||
| Prior neurologic damage | 19.6 | 1.7 | <0.0001 | 5.3 | 3.4 | 8.2 | 1.5 | <0.0001 | 4.5 | 2.9 | 7.0 | 1.6 | <0.0001 | 4.7 | 3.0 | 7.3 |
| Heart disease | 8.8 | 0.6 | 0.044 | 1.9 | 1.0 | 3.5 | ||||||||||
| Corticosteroid therapy | 11.9 | 0.7 | 0.01 | 2 | 1.2 | 3.5 | ||||||||||
| Post chest radiation | 4.9 | 1.4 | <0.001 | 4.1 | 1.9 | 8.9 | 1.1 | 0.006 | 3.1 | 1.4 | 6.9 | 1.1 | 0.007 | 3.0 | 1.4 | 6.8 |
| BUN >10.7 mmol/L | 10.2 | 0.8 | 0.008 | 2.2 | 1.2 | 3.8 | 0.8 | 0.004 | 2.3 | 1.3 | 4.1 | 0.8 | 0.004 | 2.3 | 1.3 | 4.1 |
| WBC <4 or >12 × 109/L | 54.5 | 0.6 | 0.004 | 1.8 | 1.2 | 2.7 | ||||||||||
| RDW ≤14.5% | 34.2 | 1.0 | <0.0001 | 2.9 | 1.9 | 4.2 | ||||||||||
| RDW ≤14.5% and WBC = normal | 31 | <0.0001 | Reference | |||||||||||||
| RDW >14.5% and WBC = normal | 49 | 0.5 | 0.048 | 1.7 | 1.0 | 3.0 | ||||||||||
| RDW >14.5% and WBC = abnormal | 20 | 1.4 | <0.0001 | 4.1 | 2.6 | 6.5 | ||||||||||
| Constant | -2.084 | -1.96 | -1.97 | |||||||||||||
| Hosmer and Lemeshow Test | 0.543 | 0.344 | 0.565 | |||||||||||||
| Area under curve | 0.7376 | 0.691 | 0.781 | 0.743 | 0.699 | 0.788 | 0.755 | 0.711 | 0.799 | |||||||
Elevated RDW levels on admission either alone or in combination of abnormal levels of white blood are associated with significant higher rates complicated hospitalization.
BUN, blood urea nitrogen; Coef, coefficient; RDW, red cell width distribution; WBC, white blood cells.