Table. Cohort Characteristics in a Study of XBB.1.5-Containing Vaccinesa.
| Characteristic | Entire study cohortb | Vaccinated with XBB.1.5-containing vaccineb |
|---|---|---|
| Total vaccinated | 1 076 531 | 902 803 |
| Age, mean (SD), y | 74.7 (7.4) | 74.5 (7.1) |
| Sex | ||
| Female | 578 655 (53.8) | 485 985 (53.8) |
| Male | 497 876 (46.2) | 416 818 (46.2) |
| Region of residency in Denmark | ||
| Capital | 287 942 (26.7) | 241 272 (26.7) |
| Central | 244 866 (22.7) | 206 370 (22.9) |
| Northern | 120 854 (11.2) | 100 554 (11.1) |
| Zealand | 176 838 (16.4) | 148 797 (16.5) |
| Southern | 246 009 (22.9) | 205 800 (22.8) |
| Vaccination priority groups | ||
| Age priority | 952 568 (88.5) | 810 657 (89.8) |
| High risk of severe COVID-19 | 92 829 (8.6) | 67 096 (7.4) |
| Health care workers | 31 134 (2.9) | 25 050 (2.8) |
| Vaccine type received as the fifth dose | ||
| XBB.1.5-containing vaccine | 902 803 (83.9) | 902 803 (100.0) |
| None | 172 756 (16.0) | NA |
| Other COVID-19 vaccine | 972 (0.1) | NA |
| Comorbidities | ||
| Chronic cardiac disorder | 198 438 (18.4) | 162 215 (18.0) |
| Malignancy | 89 780 (8.3) | 72 985 (8.1) |
| Autoimmune disorder | 69 137 (6.4) | 57 821 (6.4) |
| Diabetes | 57 256 (5.3) | 45 459 (5.0) |
| Psychiatric disorder | 55 281 (5.1) | 40 731 (4.5) |
| Chronic respiratory disorder | 45 302 (4.2) | 35 268 (3.9) |
| Asthma | 20 649 (1.9) | 17 822 (2.0) |
| Kidney disorder | 17 360 (1.6) | 12 771 (1.4) |
| Epilepsy | 8940 (0.8) | 7021 (0.8) |
Abbreviation: NA, not applicable.
a
Cohort consisted of all individuals aged ≥65 years vaccinated with a bivalent BA.4-5 or BA.1 mRNA booster as a fourth dose overall and those individuals receiving a monovalent XBB.1.5-containing vaccine as a fifth dose in Denmark. The start of the study period was September 15, 2022, corresponding to the national rollout date of the fourth COVID-19 vaccine dose, while the monovalent XBB.1.5-containing mRNA vaccine was administered from October 1, 2023, and the study period ended on January 8, 2024.
b
Values are numbers (percentages) unless otherwise stated.