Table 4.
Percentage hospitalized among those with pertussis in Yiwu, Zhejiang province, from 1 June 2021 to 31 May 2022.
| Age Group | Eip, n | Epc, n | Percentage Hospitalized Among Those with Pertussis a, % | 95% CrI b, % |
|---|---|---|---|---|
| <3 m | 13.2 | 20.9 | 63.1 | 51.5–86.1 |
| 3 m | 5.8 | 9.4 | 61.4 | 47.7–83.0 |
| 4 m | 7.3 | 13.8 | 52.6 | 40.0–73.6 |
| 5 m | 3.6 | 12.0 | 30.3 | 18.2–58.0 |
| 6–11 m | 0.0 | 39.2 | 0.0 | 0.0–0.0 |
| 1 y | 0.0 | 166.2 | 0.0 | 0.0–0.0 |
| 2–3 y | 3.5 | 231.2 | 1.5 | 1.0–2.5 |
| 4–5 y | 5.9 | 415.7 | 1.4 | 1.0–2.0 |
| 6–19 y | 3.7 | 1101.9 | 0.3 | 0.2–0.5 |
| 20–59 y | 0.0 | 150.5 | 0.0 | 0.0–0.0 |
| ≥60 y | 1.4 | 21.0 | 6.7 | 2.2–91.7 |
| All groups | 46.5 | 2013.2 | 2.3 | 2.0–2.7 |
a Calculated with Formula (9) in Section 2.5; b Calculated by the bootstrap method. Eip, estimated inpatient pertussis cases in all hospitals of Yiwu, calculated with Formula (4) in Section 2.4; Epc, estimated pertussis cases in the community of Yiwu, calculated with Formula (7) in Section 2.5; CrI, confidence interval; m, month; y, year.