Table 1.
Demographics and study clinical variables of ICU patients reviewed in the study
| Patient Characteristic | All patients (N=3862) | Medical patients (n=1301) | Surgical patients (n=2561) | P value (Med vs Surg.) |
|---|---|---|---|---|
| Age (years ± SD) | 66.6 (12.1) | 67.2 (13.6) | 66.3 (11.2) | <0.005* |
| Gender (% male) | 96.8 | 95.8 | 97.4 | 0.010§ |
| ICU LOS (Median, CI) | 3 (2.9–3.2) | 3 (2.9–3.3) | 2.7 (2.4–2.9) | <0.0001** |
| 30d Mortality, n (%) | 403 (10) | 324 (25) | 79 (3.1) | <0.0001§ |
| 90d Mortality, n (%) | 542 (14) | 401 (31) | 141 (5.5) | <0.0001§ |
| 1-year mortality, n (%) | 809 (21) | 527 (41) | 282 (11) | <0.0001§ |
| 24-hr indirect admission | 420 (11) | 239 (18) | 181 (7.1) | <0.0001§ |
| Code blue events | 65 (1.7) | 54 (4.2) | 11 (0.4) | <0.0001§ |
| Rapid response call | 280 (7.3) | 212 (16) | 68 (2.7) | <0.0001§ |
| Weekend admissions | 440 (11) | 215 (17) | 225 (8.8) | <0.0001§ |
| Evening admissions | 630 (17) | 328 (25) | 302 (12) | <0.0001§ |
| Severe sepsis | 831 (22) | 349 (27) | 482 (19) | <0.0001§ |
| Readmission | 703 (18) | 293 (23) | 411 (16) | <0.0001§ |
Demographics of ICU patients including medical and surgical subsets.
*
Age was analyzed by Student’s t-test;
**
Length of stay (LOS) was compared by Mann-Whitney test where median and 95% CI for median are shown;
§
all other categorical variables were analyzed by Fisher’s exact test.
Abbreviations: ICU, intensive care unit; LOS, length of stay