Table 1 Odds Ratio and Vaccine Effectiveness for Symptomatic Infection and Hospital admission among children aged 6–11 vaccinated with Coronavac

Vaccination status

Positive tests n = 89,595

Negative tests n = 108,363

OR Crude (95% CI)

OR adjusted (95% CI)

VE (%) (95% CI)

Unvaccinated

72,737 (50.99%)

69,923 (49.01%)

 0–13 days

 ≥14-2nd dose

7499 (52.22%)

8205 (28.89%)

6862 (47.78%)

20,193 (71.11%)

1.05 (1.02, 1.09)

0.39 (0.38, 0.40)

1.09 (1.05, 1.13)

0.79 (0.76, 0.81)

[−9.0 (−13.1, −4.9)]

21.2 (18.6, 23.8)

 0–13 days

 ≥14 days

630 (12.16%)

524 (7.12%)

4552 (87.84%)

6833 (92.88%)

0.13 (0.12, 0.14)

0.07 (0.07, 0.08)

0.69 (0.63, 0.76)

0.60 (0.55, 0.66)

30.8 (24.2, 36.8)

39.8 (33.7, 45.4)

Vaccination status

Positive tests n = 508

Negative tests n = 108,363

OR Crude (95% CI)

OR adjusted (95% CI)

VE (%) (95% CI)

Unvaccinated

428 (0.61%)

69,923 (99.39%)

 0–13 days

 ≥14-2nd dose

30 (0.44%)

42 (0.21%)

6862 (99.56%)

20193 (99.79%)

0.71 (0.49, 1.04)

0.34 (0.25, 0.47)

0.73 (0.49, 1.05)

0.53 (0.37, 0.73)

27.0 (−5.2, 51.1)

47.1 (26.6, 62.7)

 0–13 days

 ≥14 days

2 (0.04%)

6 (0.09%)

4552 (99.96%)

6833 (99.91%)

0.07 (0.02, 0.29)

0.14 (0.06, 0.32)

0.18 (0.03, 0.56)

0.41 (0.16, 0.89)

82.4 (44.2, 97.1)

59.2 (11.3, 84.5)