Volume 28, Number 9—September 2022
Research
Age-Dependent Effects of COVID-19 Vaccine and of Healthcare Burden on COVID-19 Deaths, Tokyo, Japan
Yura K. Ko
, Hiroaki Murayama, Lisa Yamasaki, Ryo Kinoshita, Motoi Suzuki, and Hiroshi Nishiura
, Hiroaki Murayama, Lisa Yamasaki, Ryo Kinoshita, Motoi Suzuki, and Hiroshi Nishiura
Table
Estimated COVID-19 vaccine effectiveness in terms of protection against death over test-positive and unconditional protection against death, by age group, Tokyo, Japan, January 1–August 31, 2021*
| Effect of interest, by age, y | Vaccine effectiveness (95% credible interval) |
|
|---|---|---|
| Partially vaccinated* | Fully vaccinated† | |
| Protection against death over documented infection | ||
| 30–59 y | 34.2 (2.2–71.4) | 38.0 (2.6–82.4) |
| 60–69 y | 66.1 (33.0–85.4) | 88.6 (64.3–98.1) |
| 70–79 y | 38.2 (7.3–63.8) | 83.9 (68.8–92.9) |
| 80–89 y | 46.4 (17.9–68.7) | 83.5 (72.5–91.0) |
| >90 y |
52.7 (19.6–76.6) |
77.7 (60.7–89.4) |
| Unconditional protection against death | ||
| 30–59 y | 68.7 (53.5–86.4) | 93.8 (90.3–98.2) |
| 60–69 y | 83.9 (68.1–93.0) | 99.2 (97.4–99.9) |
| 70–79y | 70.6 (55.9–82.8) | 99.3 (98.6–99.7) |
| 80–89 y | 74.5 (60.9–85.1) | 99.4 (98.9–99.6) |
| >90 y | 77.5 (61.8–88.8) | 98.4 (97.1–99.2) |
*14 d after the first vaccination and <14 d after the second vaccination. †14 d after the second vaccination.
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