Table 1.
High-frequency words in COVID-19 prevention policy texts at different stages.
| Rank | The period of COVID-19 prevention and control | The period of regular prevention and control | The period of overall adjustment | |||
|---|---|---|---|---|---|---|
| Keywords | F | Keywords | F | Keywords | F | |
| 1 | COVID-19*** | 1,717 | Nucleic acid testing** | 668 | COVID-19*** | 397 |
| 2 | Prevention and control** | 1,249 | Prevention and control** | 631 | Infection* | 313 |
| 3 | Medical*** | 736 | COVID-19*** | 581 | Medical*** | 306 |
| 4 | Services*** | 662 | Disinfection** | 462 | Joint epidemic prevention and control** | 297 |
| 5 | Patients** | 631 | Medical*** | 407 | Hospital** | 269 |
| 6 | Community* | 610 | Services*** | 357 | Treatment* | 247 |
| 7 | Isolation* | 453 | Health*** | 313 | Services*** | 225 |
| 8 | Protection** | 446 | Safety* | 266 | Virus** | 172 |
| 9 | Disinfection** | 428 | Patients** | 266 | Nucleic acid testing** | 147 |
| 10 | Psychology* | 426 | Hygiene** | 256 | Health*** | 139 |
| 11 | Medical personnel* | 383 | Laboratory* | 225 | Antigen testing* | 128 |
| 12 | Health*** | 381 | Protection** | 208 | Severe case* | 123 |
| 13 | Hygiene** | 358 | Unit* | 170 | Home quarantine* | 108 |
| 14 | Cases of disease* | 283 | Risks* | 165 | Grass roots** | 106 |
| 15 | Hospital** | 259 | Joint epidemic prevention and control** | 161 | Vaccination* | 87 |
| 16 | Grass roots** | 215 | Virus** | 148 | Seniors* | 86 |
***
Words that appear in the list of high frequency words in all three stages.
**
Words that appear in the list of high-frequency words in two of the stages.
*
Words that first appear in the list of high frequency words at this stage.