Table 2.
Summary of Pertinent Patient Metadata for 20,196 Unique Patients Infected with Omicron or Delta Variant
| Variable | Omicron variant | Delta variant | Total | Statistical analysis |
|---|---|---|---|---|
| Patients with data | 4468 (22.1) | 15,728 (77.9) | 20,196 | |
| Patient characteristics | ||||
| Median age, years | 44.3 | 48.3 | 47.6 |
P < 0.0001 (U-test) |
| Female | 2584 (57.8) | 8123 (51.6) | 10,707 (53.0) |
P < 0.0001 (Fisher exact test) |
| Male | 1884 (42.2) | 7605 (48.4) | 9489 (47.0) | |
| Race or ethnicity | ||||
| White | 1627 (36.4) | 6903 (43.9) | 8530 (42.2) |
P < 0.0001 (χ2 test) |
| Hispanic or Latino | 992 (22.2) | 4179 (26.6) | 5171 (25.6) | |
| Black | 1376 (30.8) | 3450 (21.9) | 4826 (23.9) | |
| Asian | 203 (4.5) | 531 (3.4) | 734 (3.6) | |
| Other | 29 (0.6) | 112 (0.7) | 141 (0.7) | |
| Unavailable | 241 (5.4) | 553 (3.5) | 794 (3.9) | |
| BMI | ||||
| Median BMI, kg/m2 | 29.0 | 29.6 | 29.4 |
P < 0.0001 (U-test) |
| Admission data | ||||
| Admitted | 884 (19.8) | 6779 (43.1) | 7663 (37.9) |
P < 0.0001 (Fisher exact test) Odds ratio: 0.326 (95% CI, 0.301–0.353) |
| Not admitted | 3584 (80.2) | 8949 (56.9) | 12,533 (62.1) | |
| Median LOS (discharged patients only), days | 3.2 | 5.4 | 5.2 |
P < 0.0001 (U-test) |
| Max respiratory support | ||||
| ECMO | 1 (0.1) | 19 (0.3) | 20 (0.3) |
P < 0.0001 (χ2 test) |
| Mechanical ventilation | 49 (5.5) | 727 (10.7) | 776 (10.1) | |
| Noninvasive ventilation | 63 (7.1) | 641 (9.5) | 704 (9.2) | |
| High-flow oxygen | 72 (8.1) | 1796 (26.5) | 1868 (24.4) | |
| Low-flow oxygen | 314 (35.5) | 2290 (33.8) | 2604 (34.0) | |
| Room air | 385 (43.6) | 1306 (19.3) | 1691 (22.1) | |
| Mortality | ||||
| Alive | 4430 (99.1) | 14,889 (94.7) | 19,319 (95.7) |
P < 0.0001 (Fisher exact test) Odds ratio: 0.152 (95% CI, 0.110–0.211) |
| Deceased | 38 (0.9) | 839 (5.3) | 877 (4.3) | |
| Median PCR CT | ||||
| Abbott Alinity | 20.8 (n = 1961) |
21.5 (n = 5122) |
n = 7083 |
P < 0.0001 (U-test) |
| Hologic Panther | 22.7 (n = 476) |
22.6 (n = 1298) |
n = 1774 |
P = 0.1606 (U-test) |
| Vaccine | ||||
| No vaccine | 1815 (40.6) | 11,415 (72.6) | 13,230 (65.5) |
P < 0.0001 (χ2 test) |
| >7 Days past first vaccine | 156 (3.5) | 494 (3.1) | 650 (3.2) | |
| >14 Days past second vaccine | 1786 (40.0) | 3679 (23.4) | 5465 (27.1) | |
| >14 Days past third vaccine | 711 (15.9) | 140 (0.9) | 851 (4.2) | |
Data are given as number (percentage) of patients, unless otherwise indicated.
BMI, body mass index; ECMO, extracorporeal membrane oxygenation; LOS, length of stay; Max, maximum.