Table 2.
Hazard ratios (HR) and vaccine efficacy according to vaccine status (Cox Modelsa, n = 8165)
| Variablesb | Number of events | Person-months | HR (95%CI) | Vaccine efficacy (95%CI) |
|---|---|---|---|---|
| Non-vaccinated | 326 | 25,365 | 1 (ref) | |
| mRNA BNT162b2 | ||||
| Partially vaccinated | 7 | 1615 | 0.51 (0.32–0.81) | 49.2 (19.1–68.1) |
| Fully vaccinated | 5 | 3223 | 0.054 (0.008–0.39) | 94.6 (61.0–99.2) |
| mRNA-1273 | ||||
| Partially vaccinated | 3 | 1073 | 0.62 (0.41–0.94) | 38.2 (6.3–59.2) |
| Fully vaccinated | 0 | 455 | 0.0 (ND) | |
| ChAdOx1 nCoV-19 | ||||
| Partially vaccinated | 19 | 3486 | 0.14 (0.08–0.24) | 86.2 (76.5–91.0) |
| Fully vaccinated | — | 2 | — | |
CI, confidence interval; ND, not determined.
All models were adjusted for age and occupation; missing data = 15.
a
Study period: 4th January–17th May 2021, 35 217 person-months.
b
To express the delay between vaccine and positive RT-PCR test, healthcare workers were categorized as ‘partially vaccinated’ between 14 days after the first dose and 14 days after the second dose, and ‘fully vaccinated’ thereafter.