Table 2. Inactivated vaccine effectiveness against clinical outcomes by age group.
| Outcome |
Vaccination
history |
18 to 59 years old | ≥60 years old | Total (≥18 years old) | |||||
|
Percentage/%
(case/total infection) |
Unadjusted VE/%
(95% CI) |
Percentage/%
(case/total infection) |
Unadjusted VE/%
(95% CI) |
Percentage/%
(case/total infection) |
Unadjusted VE/%
(95% CI) |
||||
| Note: “—” Means no data were available.
Abbreviations: CI=Confidence interval; VE=vaccine effectiveness. | |||||||||
| Symptomatic
disease |
Unvaccinated | 10.29 (42/408) | Ref | 29.23 (19/65) | Ref | 12.90 (61/473) | Ref | ||
| Partially | 4.89 (9/184) | 52.48 (4.45 to 76.37) | 9.52 (2/21) | 67.42 (−28.41 to 91.73) | 5.37 (11/205) | 58.39 (22.60 to 77.63) | |||
| Completely primary | 4.32 (32/740) | 57.99 (34.53 to 73.05) | 4.55 (2/44) | 84.45 (36.57 to 89.63) | 4.34 (34/784) | 66.37 (49.65 to 77.54) | |||
| BBIBP-CorV | 4.52 (9/199) | 56.07 (11.55 to 78.18) | 0 (0/12) | — | 4.27 (9/211) | 66.93 (34.66 to 83.26) | |||
| CoronaVac | 5.17 (18/329) | 49.80 (13.49 to 70.88) | 0 (0/7) | — | 5.06 (17/336) | 60.77 (34.07 to 76.65) | |||
| Combined | 2.83 (6/212) | 72.51 (36.37 to 88.12) | 8.00 (2/25) | 72.63 (−9.01 to 93.13) | 3.38 (8/237) | 73.83 (46.21 to 87.26) | |||
| Pneumonia | Unvaccinated | 7.84 (32/408) | Ref | 24.62 (16/65) | Ref | 10.15 (48/473) | Ref | ||
| Partially | 3.26 (6/184) | 58.42 (47.91 to 83.53) | 4.76 (1/21) | 80.65 (−37.27 to 97.27) | 3.41 (7/205) | 66.35 (26.90 to 84.51) | |||
| Completely primary | 2.30 (17/740) | 70.71 (47.91 to 83.53) | 4.55 (2/44) | 81.53 (23.66 to 95.53) | 2.42 (19/784) | 76.12 (59.88 to 85.79) | |||
| BBIBP-CorV | 3.02 (6/199) | 61.56 (9.58 to 83.66) | 0 (0/12) | — | 2.84 (6/211) | 71.98 (35.54 to 87.82) | |||
| CoronaVac | 5.77 (17/329) | 72.87 (39.33 to 87.87) | 0 (0/7) | — | 2.08 (7/336) | 79.47 (55.19 to 90.59) | |||
| Combined | 1.89 (4/212) | 75.94 (32.88 to 91.38) | 8.0 (2/25) | 67.50 (−31.23 to 91.95) | 2.53 (6/237) | 75.05 (42.55 to 89.17) | |||
| Severe case | Unvaccinated | 1.47 (6/408) | Ref | 13.85 (9/65) | Ref | 3.17 (15/473) | Ref | ||
| Partially | 0.54 (1/184) | 63.04 (−204.78 to 95.52) | 4.76 (1/21) | 65.61 (−155.79 to 95.38) | 0.98 (2/205) | 69.24 (−33.30 to 92.90) | |||
| Completely primary | 0 (0/740) | — | 4.55 (2/44) | 67.17 (−44.74 to 92.55) | 0.26 (2/784) | 91.96 (64.98 to 98.15) | |||
| BBIBP-CorV | 0 (0/199) | — | 0 (0/12) | — | 0 (0/211) | — | |||
| CoronaVac | 0 (0/329) | — | 0 (0/7) | — | 0 (0/336) | — | |||
| Combined | 0 (0/212) | — | 8.0 (2/25) | 42.22 (−149.05 to 86.60) | 0.84 (2/237) | 73.39 (−15.41 to 93.86) | |||