Table 1.
Baseline characteristics of subjects according to vaccination status.
| Variables | Vaccinated (n = 200) |
Unvaccinated (n = 2084) |
p-Value |
|---|---|---|---|
| Age (years); mean ± sd $ | 31.44 ± 7.72 | 29.72 ± 7.09 | 0.003 1 |
| Self-reported ethnicity, n (%) White Nonwhite |
0.106 2 | ||
| 111/183 (60.7) | 1022/1888 (54.1) | ||
| 72/183 (39.3) | 866/1888 (45.9) | ||
| Comorbidities, n (%): | |||
| Cardiac | 22/93 (23.7) | 104/842 (12.4) | 0.004 2 |
| Diabetes mellitus | 21/94 (22.3) | 144/852 (16.9) | 0.239 2 |
| Hematologic | 2/89 (2.2) | 7/814 (0.9) | 0.219 3 |
| Obesity | 14/90 (15.6) | 191/871 (21.9) | 0.204 2 |
| Asthma | 9/90 (10.0) | 65/832 (7.8) | 0.602 2 |
| Hepatic | 1/89 (1.1) | 3/810 (0.4) | 0.341 3 |
| Neurologic | 2/88 (2.3) | 9/811 (1.1) | 0.293 3 |
| Other lung diseases | 3/89 (3.4) | 9/814 (1.1) | 0.105 3 |
| Immunosuppression | 5/89 (5.6) | 11/812 (1.4) | 0.015 3 |
| Renal | 2/89 (2.2) | 9/806 (1.1) | 0.300 3 |
| Education, n (%) | 0.116 2 | ||
| Up to 9 years | 20/101 (19.8) | 279/1044 (26.7) | |
| From 9 to 12 years | 55/101 (54.5) | 573/1044 (54.9) | |
| Over 12 years | 26/101 (25.7) | 192/1044 (18.4) | |
| Residence area, n (%) | 0.850 3 | ||
| Urban | 179/188 (95.2) | 1838/1957 (93.9) | |
| Periurban | 0 (0.0) | 6/1957 (0.3) | |
| Rural | 9/188 (4.8) | 113/1957 (5.8) |
n: number; sd: standard deviation; 1: Student’s t-test; 2: chi-square test; 3: Fisher’s exact test; $: Cohen’s d = −0.24 (95% CI −0.39–0.10—small).