Table 1.
Baseline characteristics of adolescents 12–20 years of age in the study of overall effectiveness, direct and indirect effect of the BNT162b2 vaccine on long COVID during the period when the Delta variant was prevalent.
| Delta study in adolescents | |||
|---|---|---|---|
| Vaccinated (N = 88,811) | Unvaccinated (N = 23,779) | Overall (N = 112,590) | |
| Age | |||
| Median [Q1, Q3] | 14 [13, 16] | 15 [13, 17] | 15 [13, 16] |
| Distribution | |||
| 12 | 16,867 (19.0%) | 3331 (14.0%) | 20,198 (17.9%) |
| 13 | 15,697 (17.7%) | 3107 (13.1%) | 18,804 (16.7%) |
| 14 | 15,127 (17.0%) | 3214 (13.5%) | 18,341 (16.3%) |
| 15 | 14,204 (16.0%) | 3138 (13.2%) | 17,342 (15.4%) |
| 16 | 10,091 (11.4%) | 2985 (12.6%) | 13,076 (11.6%) |
| 17 | 7580 (8.5%) | 2771 (11.7%) | 10,351 (9.2%) |
| 18 | 4098 (4.6%) | 2043 (8.6%) | 6141 (5.5%) |
| 19 | 2936 (3.3%) | 1778 (7.5%) | 4714 (4.2%) |
| 20 | 2211 (2.5%) | 1412 (5.9%) | 3623 (3.2%) |
| Gender | |||
| Female | 46,650 (52.5%) | 12,830 (54.0%) | 59,480 (52.8%) |
| Male | 42,161 (47.5%) | 10,949 (46.0%) | 53,110 (47.2%) |
| Ethnicity | |||
| White | 26,971 (30.4%) | 12,373 (52.0%) | 39,344 (34.9%) |
| Black/AA | 16,044 (18.1%) | 4833 (20.3%) | 20,877 (18.5%) |
| Hispanic | 35,147 (39.6%) | 4112 (17.3%) | 39,259 (34.9%) |
| Asian/PI | 3521 (4.0%) | 426 (1.8%) | 3947 (3.5%) |
| Multiple | 1521 (1.7%) | 520 (2.2%) | 2041 (1.8%) |
| Other/Unknown | 5607 (6.3%) | 1515 (6.4%) | 7122 (6.3%) |
| Hospital | |||
| A | 4989 (5.6%) | 3160 (13.3%) | 8149 (7.2%) |
| B | 10,894 (12.3%) | 2395 (10.1%) | 13,289 (11.8%) |
| C | 7408 (8.3%) | 1865 (7.8%) | 9273 (8.2%) |
| D | 3115 (3.5%) | 1431 (6.0%) | 4546 (4.0%) |
| E | 998 (1.1%) | 740 (3.1%) | 1738 (1.5%) |
| F | 1386 (1.6%) | 643 (2.7%) | 2029 (1.8%) |
| G | 1655 (1.9%) | 1167 (4.9%) | 2822 (2.5%) |
| H | 1000 (1.1%) | 1345 (5.7%) | 2345 (2.1%) |
| I | 3189 (3.6%) | 2959 (12.4%) | 6148 (5.5%) |
| J | 13,315 (15.0%) | 1855 (7.8%) | 15,170 (13.5%) |
| K | 37,399 (42.1%) | 2855 (12.0%) | 40,254 (35.8%) |
| L | 2234 (2.5%) | 1376 (5.8%) | 3610 (3.2%) |
| M | 1229 (1.4%) | 1988 (8.4%) | 3217 (2.9%) |
| Entry time | |||
| 07/2021 | 40,073 (45.1%) | 9351 (39.3%) | 49,424 (43.9%) |
| 08/2021 | 48,738 (54.9%) | 14,428 (60.7%) | 63,166 (56.1%) |
| Obesity | |||
| Nonobese | 27,459 (30.9%) | 10,475 (44.1%) | 37,934 (33.7%) |
| Obese | 50,789 (57.2%) | 10,385 (43.7%) | 61,174 (54.3%) |
| Unknown | 10,563 (11.9%) | 2919 (12.3%) | 13,482 (12.0%) |
| PMCA | |||
| 0 | 64,877 (73.1%) | 14,509 (61.0%) | 79,386 (70.5%) |
| 1 | 14,988 (16.9%) | 4653 (19.6%) | 19,641 (17.4%) |
| 2 | 8946 (10.1%) | 4617 (19.4%) | 13,563 (12.0%) |
| Negative tests prior entry | |||
| 0 | 73,356 (82.6%) | 13,309 (56.0%) | 86,665 (77.0%) |
| 1 | 11,450 (12.9%) | 6220 (26.2%) | 17,670 (15.7%) |
| 2 | 2611 (2.9%) | 2213 (9.3%) | 4824 (4.3%) |
| ≥3 | 1394 (1.6%) | 2037 (8.6%) | 3431 (3.0%) |