Table 1.
Baseline characteristics of the subjects according to vaccination status.
| Variables | Vaccinated (n = 832) |
Unvaccinated (n = 2538) |
p-Value |
|---|---|---|---|
| Age (years); median ± sd $ | 29.81 ± 6.78 | 30.44 ± 7.27 | 0.0234 1 |
| Ethnicity, n (%) White Non-white |
0.001 2 | ||
| 387/773 (50.1) | 997/2308 (43.2) | ||
| 386/773 (49.9) | 1311/2308 (56.8) | ||
| Comorbidities, n (%): | |||
| Cardiac | 61/371 (16.4) | 149/1143 (13.0) | 0.1181 2 |
| Diabetes mellitus | 59/371 (15.9) | 163/1158 (14.1) | 0.4327 2 |
| Hematologic | 6/359 (1.7) | 14/1122 (1.2) | 0.599 3 |
| Obesity | 48/366 (13.1) | 130/1145 (11.4) | 0.4141 2 |
| Asthma | 45/368 (12.2) | 83/1135 (7.3) | 0.0047 2 |
| Hepatic | 1/360 (0.3) | 11/1112 (1.0) | 0.3134 3 |
| Neurologic | 10/362 (2.8) | 19/1121 (1.7) | 0.2905 2 |
| Other lung diseases | 9/362 (2.5) | 21/1124 (1.9) | 0.6086 2 |
| Immunosuppression | 6/360 (1.7) | 37/1120 (3.3) | 0.1532 2 |
| Renal | 5/358 (1.4) | 13/1113 (1.2) | 0.7825 3 |
| Education, n (%) Up to 9 years From 9 to 12 years Over 12 years |
<0.001 2 | ||
| 103/577 (17.9) | 351/1406 (25.0) | ||
| 335/577 (58.1) | 806/1406 (57.3) | ||
| 139/577 (24.1) | 249/1406 (17.7) | ||
| Residence area, n (%) Urban Periurban Rural |
0.9147 3 | ||
| 749/790 (94.8) | 2270/2388 (95.1) | ||
| 2/790 (0.3) | 8/2388 (0.3) | ||
| 39/790 (4.9) | 110/2388 (4.6) |
n: number; sd: standard deviation; 1, Student’s t-test; 2, Chi-square test; 3, Fisher’s exact test; $, Cohen’s d = 0.09 (95% CI 0.01–0.17: very small).