Table 6.
Logistic Multivariate Regression Analysis on Extended Length of Stay.a
| Univariate model | Multivariate model | P value | |
|---|---|---|---|
| Age | |||
| 50-64 | REFERENCE | ||
| 65-79 | 1.26 (1.04, 1.52) | 1.12 (0.84, 1.48) | 0.436 |
| 80+ | 1.78 (1.11, 2.85) | 1.97 (1.10, 3.55) | 0.023 |
| Female sex | 0.98 (0.82, 1.18) | 0.93 (0.75, 1.15) | 0.488 |
| Race | |||
| White | REFERENCE | ||
| Black | 1.95 (1.50, 2.54) | 1.94 (1.45, 2.60) | <0.001 |
| Hispanic | 1.92 (1.29, 2.85) | 1.88 (1.21, 2.94) | 0.005 |
| Other | 1.14 (0.73, 1.79) | 1.27 (0.77, 2.08) | 0.348 |
| Income Quartile | |||
| 0-25th | REFERENCE | ||
| 26-50th | 0.67 (0.52, 0.86) | 0.68 (0.52, 0.89) | 0.006 |
| 51-75th | 0.71 (0.55, 0.91) | 0.70 (0.52, 0.94) | 0.018 |
| 76-100th | 0.63 (0.47, 0.84) | 0.59 (0.44, 0.81) | 0.001 |
| Healthcare Coverage | |||
| Medicare | REFERENCE | ||
| Medicaid | 1.16 (0.83, 1.61) | 1.05 (0.69, 1.60) | 0.834 |
| Private Insurance | 0.65 (0.53, 0.79) | 0.76 (0.57, 1.01) | 0.055 |
| Other | 0.79 (0.53, 1.16) | 0.81 (0.51, 1.29) | 0.377 |
| Hospital Bed Size | |||
| Small | REFERENCE | ||
| Medium | 1.33 (0.95, 1.86) | 1.31 (0.92, 1.87) | 0.132 |
| Large | 1.67 (1.22, 2.29) | 1.50 (1.08, 2.08) | 0.016 |
| Hospital Region | |||
| Northeast | REFERENCE | ||
| Midwest | 0.90 (0.62, 1.30) | 0.72 (0.49, 1.07) | 0.103 |
| South | 0.65 (0.46, 0.91) | 0.55 (0.38, 0.79) | 0.001 |
| West | 0.83 (0.57, 1.21) | 0.75 (0.50, 1.13) | 0.167 |
| Hospital Type | |||
| Rural | REFERENCE | ||
| Urban Non-Teaching | 1.62 (0.86, 3.06) | 1.73 (0.83, 3.60) | 0.144 |
| Urban Teaching | 1.97 (1.07, 3.62) | 1.87 (0.92, 3.80) | 0.083 |
| Comorbidity | |||
| Affective disorder | 1.35 (1.11, 1.65) | 1.24 (0.99, 1.56) | 0.060 |
| Congestive heart failure |
2.75 (1.80, 4.20) | 1.96 (1.20, 3.20) | 0.007 |
| Cardiac arrhythmias | 2.89 (2.14, 3.90) | 2.06 (1.44, 2.94) | <0.001 |
| Hypertension, combined | 1.48 (1.23, 1.79) | Removed | |
| Paralysis | 3.43 (1.79, 6.57) | 2.68 (1.37, 5.27) | 0.004 |
| Other neurological disorders |
2.88 (1.91, 4.33) | 2.05 (1.30, 3.25) | 0.002 |
| Chronic pulmonary disease |
1.57 (1.26, 1.96) | 1.50 (1.16, 1.94) | 0.002 |
| Hypothyroidism | 1.39 (1.08, 1.78) | Removed | |
| Renal failure | 2.22 (1.61, 3.06) | Removed | |
| Coagulopathy | 2.66 (1.19, 5.95) | Removed | |
| Obesity | 1.84 (1.46, 2.32) | 1.63 (1.24, 2.14) | <0.001 |
| Fluid and electrolyte disorders |
6.50 (4.54, 9.32) | 4.75 (3.13, 7.20) | <0.001 |
| Fusion Levels | |||
| One level | REFERENCE | ||
| Two levels or more | 1.52 (1.22, 1.91) | 1.72 (1.33, 2.21) | <0.001 |
| Number of Complications | |||
| 0 | REFERENCE | ||
| 1 | 5.94 (4.65, 7.59) | 5.10 (3.95, 6.57) | <0.001 |
| >1 | 22.56 (8.21, 61.96) | 19.08 (7.16, 50.87) | <0.001 |
aBold indicates statistical significance was met on the univariate and multivariate analyses respectively.