Table 1. Demographic and clinical profile of Omicron and non-Omicron patients (N=1,722).
| Omicron N (%) | Non-Omicron | ||||
| Variables | Categories | Symptomatic n=267 | Asymptomatic n=389 | Symptomatic n=461 | Asymptomatic n=605 |
| Cause of testing in asymptomatic cases | Symptomatic | 267 (100.0) | 0 (0.0) | 461 (100.0) | 0 (0.0) |
| Cancer chemotherapy or before surgery | 0 (0.0) | 288 (74.0) | 0 (0.0) | 279 (46.1) | |
| Self tested | 0 (0.0) | 48 (12.3) | 0 (0.0) | 187 (30.9) | |
| Patient attendant | 0 (0.0) | 25 (6.4) | 0 (0.0) | 87 (14.4) | |
| Travel | 0 (0.0) | 6 (1.5) | 0 (0.0) | 17 (2.8) | |
| Job interview | 0 (0.0) | 15 (3.8) | 0 (0.0) | 13 (2.2) | |
| Contact with COVID-19 positive case | 0 (0.0) | 7 (1.8) | 0 (0.0) | 22 (3.6) | |
| Blood group | A-ve | 2 (0.7) | 12 (3.1) | 2 (0.4) | 9 (1.5) |
| A+ve | 35 (13.1) | 64 (16.5) | 93 (20.1) | 98 (16.2) | |
| AB-ve | 1 (0.3) | 2 (0.5) | 2 (0.4) | 1 (0.1) | |
| AB+ve | 15 (5.6) | 18 (4.6) | 40 (8.7) | 21 (3.4) | |
| B-ve | 5 (1.9) | 11 (2.8) | 5 (1.1) | 7 (1.1) | |
| B+ve | 85 (31.8) | 119 (30.5) | 122 (26.5) | 198 (32.7) | |
| O-ve | 4 (1.5) | 6 (1.5) | 8 (1.7) | 3 (0.5) | |
| O+ve | 119 (44.6) | 148 (38.0) | 169 (36.7) | 243 (40.1) | |
| Not available | 3 (1.1) | 7 (1.8) | 20 (4.3) | 25 (4.1) | |
| Reinfection | No | 232 (86.9) | 325 (83.5) | 407 (88.3) | 521 (86.1) |
| Yes | 35 (13.1) | 64 (16.5) | 54 (11.7) | 84 (13.9) | |
| Hospitalization | No | 256 (95.9) | 377 (96.9) | 416 (90.2) | 574 (94.9) |
| Yes | 11 (4.1) | 12 (3.1) | 45 (9.8) | 31 (5.1) | |
| Vaccination status | Unvaccinated | 28 (10.5) | 21 (5.4) | 31 (6.7) | 10 (1.6) |
| Vaccinated | 234 (87.6) | 357 (91.7) | 414 (89.8) | 571 (94.4) | |
| Data not available | 5 (1.9) | 11 (2.8) | 16 (3.5) | 24 (4.0) | |
| Type of vaccination | Fully vaccinated (two doses) | 167 (62.5) | 268 (68.9) | 304 (65.9) | 447 (73.9) |
| Three doses | 9 (3.4) | 14 (3.6) | 42 (9.1) | 28 (4.6) | |
| Two doses (<14 days) | 16 (5.6) | 9 (2.3) | 31 (6.7) | 28 (4.6) | |
| Partial vaccinated | 12 (4.5) | 19 (4.9) | 29 (6.2) | 31 (5.1) | |
| One dose (<21 days) | 30 (11.2) | 47 (12.1) | 8 (1.7) | 37 (6.1) | |