Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
支援武汉天数与暴露风险事件发生种类数量的关系
The relationship between days in Wuhan and the number of types of protective exposure risk events n/(%)
| Days in Wuhan | ≤1 kind | 2-4 kinds | ≥5 kinds |
| 10-20 d | 11 (61.1) | 6 (33.3) | 1 (5.6) |
| 21-30 d | 110 (52.4) | 94 (44.8) | 6 (2.9) |
| 31-40 d | 32 (53.3) | 27 (45.0) | 1 (1.7) |
| ≥41 d | 10 (62.5) | 3(18.8) | 3 (18.8) |
