Table 1.
Baseline characteristics between COVID-19 patients in wild-type and delta variant cohorts.
| Total (n = 677) | Wild type (n = 341) | Delta variant (n = 336) | p | |
|---|---|---|---|---|
| Age | 53.0 (38.0–66.0) | 54.0 (42.0–66.0) | 52.0 (35.0–66.0) | 0.057 |
| Gender, male | 317 (46.8%) | 172 (50.4%) | 145 (43.2%) | 0.058 |
| Onset to hospitalization, day | 3.0 (2.0–5.0) | 4.0 (3.0–5.0) | 2.0 (1.0–4.0) | <0.0001 |
| Smoking history | 122 (18.0%) | 92 (27.0%) | 30 (8.9%) | <0.0001 |
| Mortality | 60 (8.9%) | 60 (17.6%) | 0 (0) | <0.0001 |
| Comorbidity | ||||
| Hypertension | 171 (25.3%) | 81 (23.8%) | 90 (26.8%) | 0.364 |
| Diabetes | 73 (10.8%) | 42 (12.3%) | 31 (9.2%) | 0.195 |
| Cardiovascular diseases | 36 (5.3%) | 14 (4.1%) | 22 (6.5%) | 0.157 |
| Bronchitis | 30 (4.4%) | 26 (7.6%) | 4 (1.2%) | <0.0001 |
| Symptoms | ||||
| Cough | 450 (66.5%) | 282 (82.7%) | 168 (50.0%) | <0.0001 |
| Fever | 397 (58.6%) | 276 (80.9%) | 121 (36.0%) | <0.0001 |
| Fatigue | 206 (30.4%) | 130 (38.1%) | 76 (22.6%) | <0.0001 |
| Expectoration | 97 (14.3%) | 58 (17.0%) | 39 (11.6%) | 0.045 |
| Sore throat | 84 (12.4%) | 0 (0) | 84 (25.0%) | <0.0001 |
| Chest pain | 73 (10.8%) | 66 (19.4%) | 7 (2.1%) | <0.0001 |
| Diarrhea | 72 (10.6%) | 49 (14.4%) | 23 (6.8%) | 0.002 |
| Dyspnea | 49 (7.2%) | 47 (13.8%) | 2 (0.6%) | <0.0001 |
| Abdominal pain | 49 (7.2%) | 45 (13.2%) | 4 (1.2%) | <0.0001 |
| Vomiting | 39 (5.8%) | 37 (10.9%) | 2 (0.6%) | <0.0001 |