Table 1.
Background characteristics of the study population, including 7 565 girls aged 12–15 years.
| Vaccinated with 1 dose of COVID-19 vaccinea (n = 6196) |
Unvaccinated (n = 1369) |
|||
|---|---|---|---|---|
| n | % | n | % | |
| Birth year | ||||
| 2006 | 2393 | 38.6 | 451 | 32.9 |
| 2007 | 2198 | 35.5 | 484 | 35.4 |
| 2008 | 1368 | 22.1 | 354 | 25.9 |
| 2009 | 223 | 3.6 | 79 | 5.8 |
| Missing | 14 | 0.2 | 1 | 0.1 |
| Maternal level of education | ||||
| < High school | 251 | 4.1 | 79 | 5.8 |
| High school | 1349 | 21.8 | 367 | 26.8 |
| College ≤ 4 years | 2700 | 43.6 | 569 | 41.6 |
| >4 years college | 1758 | 28.4 | 320 | 23.4 |
| Missing | 138 | 2.2 | 34 | 2.5 |
| Maternal COVID-19 vaccination status | ||||
| Vaccinated | 6173 | 99.6 | 1225 | 89.5 |
| Unvaccinated | 23 | 0.4 | 144 | 10.5 |
| History of laboratory confirmed SARS-CoV-2 infection | ||||
| Yes | 94 | 1.5 | 384 | 28.0 |
| No | 6102 | 98.5 | 985 | 72.0 |
a
Nearly all (99.9%) were vaccinated with the mRNA Comirnaty (BNT162b2) vaccine, which was recommended for children with no history of SARS-CoV-2 infection.