Table 2.
Standardized incidence ratio (SIR), attributable risk fraction (ARF), and attributable risk (AR) for the second vaccine dose, stratified by sex and age groups.
| Sex and age group (years) | Vaccinated with the second dose1(n) | Observed cases2(n) | Risk per 100,000 vaccinees3 | Expected cases (2019 reference)4(n) | SIR5 (95% CI) | ARF6 | AR per 100,000 vaccinees7 |
|---|---|---|---|---|---|---|---|
| All8 | 2434674 | 152 | 6.24 | 130.49 | 1.16 (0.99-1.36) | 0.14 | 0.86 |
| Males(n=1,178,077) | |||||||
| 16-44 | 602455 | 36 | 5.98 | 27.39 | 1.13 (0.93-1.80) | 0.12 | 0.69 |
| 45-64 | 321982 | 29 | 9.01 | 29.02 | 1.00 (0.68-1.42) | 0.00 | 0.00 |
| 65+ | 253640 | 26 | 10.25 | 17.53 | 1.48 (0.99-2.14) | 0.32 | 3.32 |
| Females(n=1,256,597) | |||||||
| 16-44 | 609135 | 21 | 3.45 | 25.96 | 0.81 (0.51-1.21) | -0.23 | -0.81 |
| 45-64 | 335129 | 22 | 6.56 | 17.40 | 1.26 (0.81-1.88) | 0.21 | 1.35 |
| 65+ | 312333 | 18 | 5.76 | 13.18 | 1.37 (0.83-2.12) | 0.27 | 1.56 |
Number of those who received the second vaccine dose between 10 January 2021 and 30 April 2021.
Number of observed cases of Bell's palsy that occurred within 30 days after the receipt of the second dose.
The risk of Bell's palsy within 30 days after the second vaccine dose, estimated by dividing the number of observed cases by the number of vaccinees and reported per 100,000 vaccinees.
Expected number of cases of Bell's palsy as estimated based on the experience of CHS population between January-May 2019.
Standardized incidence ratio (SIR), computed by dividing the observed cases by the expected cases of Bell's palsy.
Attributable risk fraction (ARF) among exposed (vaccinated), calculated as (SIR-1)/SIR.
Attributable risk (AR) per 100,000 vaccinees, estimated by multiplying ARF by the risk of Bell's palsy among vaccinated.
Age and sex weighted.