Table II.
Comparison of profile of suspected Omicron versus non-Omicron cases from Tamil Nadu, December 2021-January 2022
| Description | Suspected Omicron cases (n=1175), n (%) | Suspected non-Omicron cases (n=634), n (%) | P |
|---|---|---|---|
| Median age (IQR) | 37 (24-50) | 36 (23-49) | |
| Age >60 yr | 108 (9.2) | 63 (9.9) | 0.605 |
| Male sex | 746 (63.5) | 390 (61.5) | 0.407 |
| Overall comorbidity | 234 (19.9) | 117 (18.5) | 0.454 |
| Diabetes | 132 (11.2) | 82 (12.9) | |
| Hypertension | 116 (9.9) | 61 (9.6) | |
| Symptomatic | 758 (64.5) | 428 (67.5) | 0.201 |
| Fever | 508 (43.2) | 315 (49.7) | 0.018 |
| Cough | 249 (21.2) | 165 (26.0) | 0.048 |
| Sore throat | 202 (17.2) | 131 (20.7) | 0.145 |
| Vaccination status | n=1043 | n=567 | |
| Unvaccinated | 141 (13.5) | 82 (14.5) | |
| One dose (<21 days) | 2 (0.2) | 1 (0.2) | |
| Partially vaccinated (valid one dose) | 148 (14.2) | 61 (10.8) | 0.094 |
| Two dose (<14 days) | 41 (3.9) | 20 (3.5) | |
| Fully vaccinated (valid two doses) | 703 (67.4) | 395 (69.7) | 0.821 |
| Three doses | 8 (0.8) | 8 (1.4) | |
| n=1175 | n=674 | ||
| History of previous infection | 72 (6.2) | 21 (3.3) | 0.215 |
| Hospitalization | 540 (46.0) | 280 (44.2) | 0.465 |
| Median admission day (IQR) | 5 (4-7) | 6 (5-9) | |
| Required oxygen | 5 (0.4) | 10 (1.6) | 0.010 |
| Outcome-deaths | 0 | 4 (0.6) | 0.007 |
| Duration between receipt of second dose and positive test result | n=703 | n=395 | |
| >90 days | 511 (72.7) | 294 (74.4) | 0.721 |
| 61-90 days | 77 (11.0) | 35 (8.8) | |
| 31-60 days | 71 (10.1) | 39 (9.8) | |
| 14-30 days | 44 (6.3) | 27 (6.8) |
IQR, interquartile range