Table 2 The index range of risk classification of the epidemic
Index | Application stage | Prerequisites | Index range | Risk level description | Risk score |
|---|---|---|---|---|---|
\({\mathrm{C}3}_{j}\) | Early | (1) Exist new cases in past 9 days (2) Day \(j-1\) is no risk | \({\mathrm{C}3}_{j}\ge 2\) | Low-medium (outbreak) | 2 |
\({\mathrm{MA}}_{j}\) | Whole | C3 signal | \({P}_{40}<{\mathrm{MA}}_{j}\le {P}_{60}\) | Medium | 3 |
\({P}_{60}<{\mathrm{MA}}_{j}\le {P}_{80}\) | Medium–high | 4 | |||
\({\mathrm{MA}}_{j}>{P}_{80}\) | High | 5 | |||
C1 signal | \({P}_{20}<{\mathrm{MA}}_{j}\le {P}_{40}\) or \({\mathrm{MA}}_{j}\le {P}_{40}\), \({x}_{j}>100\) (1) \({\mathrm{MA}}_{j}\le {P}_{20}\) (2) \(x_j\ \le\ 100\) | Medium–low | 2 | ||
Low | 1 | ||||
\({\mathrm{C}1}_{j}\) | Late | (1) Risk score on day \(j-1\) is 3 (2) \({\mathrm{MA}}_{j}\le {P}_{40}\) | \({\mathrm{C}1}_{j}\ge 3\) | Low-medium (epidemic subsided) | 2 |
\({x}_{j}\) | Whole | C3 signal | \({x}_{j-\left(T-1\right), \cdots ,}\) \({x}_{j}\le 5\) | No risk (shutdown C3 signal) | 0 |