Table 2.
Logistic regression model
| Variable | Estimate | OR | 95% CI | P-value | |
|---|---|---|---|---|---|
| Arformoterol | −0.377 | 0.686 | 0.511 | 0.920 | 0.012 |
| Female sex | −0.077 | 0.858 | 0.663 | 1.11 | 0.244 |
| Age group | |||||
| 40–50 years | −0.050 | 0.870 | 0.457 | 1.656 | 0.821 |
| 51–60 years | −0.039 | 0.879 | 0.617 | 1.252 | 0.800 |
| Nonwhite race | 0.044 | 1.092 | 0.814 | 1.465 | 0.557 |
| Rural hospital | 0.034 | 1.070 | 0.75 | 1.525 | 0.710 |
| Teaching hospital | 0.152 | 1.164 | 0.865 | 1.566 | 0.317 |
| Total hospital beds, n | 0.00017 | 1.000 | 0.999 | 1.001 | 0.641 |
| Primary diagnosis of COPD | 0.191 | 1.210 | 0.912 | 1.606 | 0.186 |
| Emergency admission | 0.058 | 1.123 | 0.827 | 1.526 | 0.457 |
| Length of stay, days | 0.016 | 1.016 | 0.999 | 1.033 | 0.065 |
| APR-DRG severity of illness | |||||
| Moderate | 0.433 | 1.542 | 0.823 | 2.886 | 0.176 |
| Major | 0.637 | 1.890 | 1.023 | 3.491 | 0.042 |
| Extreme | 0.911 | 2.487 | 1.276 | 4.846 | 0.007 |
| Oxygen therapy | −0.030 | 0.970 | 0.713 | 1.321 | 0.848 |
| Respiratory therapy | −0.171 | 0.843 | 0.371 | 1.914 | 0.682 |
| Anticholinergic use | −0.136 | 0.873 | 0.649 | 1.175 | 0.370 |
| Corticosteroid use | 0.251 | 1.286 | 0.905 | 1.826 | 0.160 |
| Antibiotic use | 0.109 | 1.115 | 0.794 | 1.564 | 0.530 |
| Intercept | −2.907 | <0.001 | |||
Abbreviations: APR-DRG, 3M™ All Patient Refined™-Diagnosis Related Groups; CI, confidence interval; OR, odds ratio; COPD, chronic obstructive pulmonary disease.