Table 2.
Description and source of parameters in the age-specific model
| Parameter | Description | Unit | Value | Range | Method |
|---|---|---|---|---|---|
| βii * | Transmission relative rate among age group i | Individuals-1·days-1 | – | ≥ 0 | Curve fitting |
| βij * | Transmission relative rate from age group i to j | Individuals-1·days-1 | – | ≥ 0 | Curve fitting |
| βji * | Transmission relative rate from age group j to i | Individuals-1·days-1 | – | ≥ 0 | Curve fitting |
| βjj * | Transmission relative rate among age group i | Individuals-1·days-1 | – | ≥ 0 | Curve fitting |
| κ | Relative transmissibility rate of asymptomatic to symptomatic individuals | 1 | 0.65 | 0–1 | [12, 21, 22] |
| p | Proportion of the asymptomatic | 1 | 0.36 | 0.016–0.78 | [23, 24] |
| ω | Incubation relative rate | Days-1 | 0.2 | 0.05556–0.5 | [20, 25–27] |
| ω' | Latent relative rate | Days-1 | 0.2 | 0.05556–0.5 | [20, 25–27] |
| γ | Recovered/Removed rate of the infectious | Days-1 | 0.2 | 0.1111–0.3333 | [27–31] |
| γ' | Recovered/Removed rate of the asymptomatic | Days-1 | 0.1 | 0.04762–1 | [32] |
| fi | Fatality of the disease of age group i | 1 | – | 0–1 | Analysis of data |
| δ | Vaccination rate | Days-1 | – | 0–1 | Assumption |
| φ | Immune relative rate | 1 | – | 0–1 | [33–37] |
| λ | Vaccine efficacy | 1 | – | 0–1 | [38–50] |
| θ | Proportion of herd immunity | 1 | 0 | 0–1 | Assumption |
| x | Decreasing proportion of vaccine efficacy against susceptibility | 1 | 0.6 | 0–1 | [18] |
| y | Decreasing proportion of vaccine efficacy against infectivity | 1 | 0.6 | 0–1 | [18] |
| z | Decreasing proportion of vaccine efficacy against pathogenicity | 1 | 0.33 | 0–1 | [18] |
– Not applicable