Univariate and multivariable regression models of patient, physician and situational characteristics associated with a short stay after admission to general internal medicine
| Characteristic | Model A: < 24 h | Model B: ≤ 72 h | ||
|---|---|---|---|---|
| Univariate OR* (95% CI) | Multivariable adjusted OR* (95% CI) | Univariate OR* (95% CI) | Multivariable adjusted OR* (95% CI) | |
| Patients | ||||
| Age | 0.98 (0.98–0.98) | 0.99 (0.99–0.99) | 0.98 (0.98–0.98) | 0.99 (0.99–0.99) |
| Female sex | 1.06 (0.98–1.14) | 0.96 (0.90–1.02) | 1.05 (1.01–1.10) | 0.97 (0.94–1.01) |
| Charlson Comorbidity Index score | ||||
| 0 | 3.10 (2.79–3.44) | 1.97 (1.79–2.16) | 2.77 (2.62–2.94) | 1.75 (1.66–1.84) |
| 1 | 1.98 (1.76–2.22) | 1.63 (1.47–1.79) | 1.91 (1.79–2.03) | 1.54 (1.46–1.62) |
| 2 | 1.33 (1.16–1.52) | 1.20 (1.08–1.34) | 1.46 (1.36–1.56) | 1.29 (1.21–1.36) |
| Not transported via ambulance | 2.03 (1.88–2.20) | 1.44 (1.34–1.54) | 1.92 (1.84–2.00) | 1.47 (1.41–1.53) |
| Admitted to general internal medicine at a study site in prior 30 d* | 0.54 (0.44–0.65) | 0.84 (0.75–0.94) | 0.53 (0.48–0.59) | 0.77 (0.73–0.82) |
| Laboratory-based Acute Physiology Score | 0.96 (0.96–0.97) | 0.97 (0.97–0.98) | 0.97 (0.97–0.97) | 0.98 (0.98–0.98) |
| Physicians | ||||
| Female sex | 0.83 (0.77–0.91) | 0.80 (0.74–0.86) | 0.84 (0.80–0.88) | 0.82 (0.79–0.86) |
| Years since graduation | 1.00 (1.00–1.01) | 1.00 (1.00–1.00) | 1.00 (1.00–1.00) | 1.00 (1.00–1.00) |
| Situational | ||||
| Admitted weekday | 1.34 (1.23–1.47) | 1.26 (1.17–1.36) | 1.09 (1.03–1.14) | 1.05 (1.01–1.10) |
| Admitted evening | 2.53 (2.22–2.88) | 2.61 (2.33–2.92) | 1.20 (1.13–1.28) | 1.24 (1.17–1.30) |
| Admitted night | 2.93 (2.57–3.33) | 2.73 (2.44–3.06) | 1.31 (1.23–1.39) | 1.29 (1.22–1.37) |
| Admissions to general internal medicine in prior 12 h | 1.05 (1.04–1.06) | 1.01 (1.00–1.02) | 1.02 (1.02–1.03) | 1.00 (1.00–1.01) |
| Admitted to short-stay unit | 2.26 (2.03–2.52) | 1.56 (1.39–1.75) | 3.06 (2.83–3.31) | 2.35 (2.17–2.54) |
| Fiscal year of admission | 1.09 (1.04–1.14) | 1.09 (1.05–1.14) | 1.05 (1.03–1.08) | 1.05 (1.03–1.08) |
Note: CI = confidence interval, OR = odds ratio.
↵* Derived from logistic regression models with the use of generalized estimating equations to account for clustering of admissions within physicians. The multivariable model included all covariates listed in the table. For variables with more than 2 categories, the reference categories were Charlson Comorbidity Index score 3 (high comorbidity) and admission in the day (v. evening and night).