TABLE 2.
Characteristics of All Admissions
| Characteristic | Among All Hospitals (N = 10 724) | Highest Quartile SLE Volume Hospitals (n = 5289) | Lowest Quartile SLE Volume Hospitals (n = 836) | P a |
|---|---|---|---|---|
| LOS, median (min, max), d | 2 (1, 366) | 2 (1, 366) | 3 (1, 61) | <.001 |
| Readmissions per patient, median (min, max) | 1 (1, 84) | 2 (1, 84) | 2 (1, 21) | .001 |
| In-hospital mortality, n (%) | 41 (0.4) | 17 (0.3) | 1 (0.1) | .50 |
| ICU admissions, n (%) | 1118 (10.4) | 515 (9.7) | 99 (11.8) | .06 |
| LOS in ICU, median (min, max), d | 9 (1, 366) | 10 (1, 366) | 9 (1, 61) | .19 |
| Severity of illness index, n (%) | <.001 | |||
| Not applicable | 10 (0.1) | 5 (0.1) | 1 (0.1) | |
| Minor | 2348 (21.9) | 1314 (24.8) | 132 (15.8) | |
| Moderate | 4302 (40.1) | 2224 (42.0) | 325 (38.9) | |
| Major | 3192 (29.8) | 1357 (25.7) | 292 (34.9) | |
| Extreme | 872 (8.1) | 389 (7.4) | 86 (10.3) |
Hospital volume was divided into quartiles of inpatient SLE admissions per year. max, maximum; min, minimum.
a
P values are based on Wilcoxon rank-sum test for LOS and Pearson’s χ2 test for frequencies (percentages); all comparisons are top quartile to bottom quartile.