Table 2.
Sample statistics and definition of selected variables.
| City |
Definition | Beijing |
Shanghai |
||
|---|---|---|---|---|---|
| Variable | Mean | S.D. | Mean | S.D. | |
| Y | Relative change of metro ridership (%) | −35.06 | 25.37 | −21.19 | 23.36 |
| COVID19 | Number of local COVID-19 cases per day | 1.37 | 4.77 | 0.62 | 2.98 |
| COVID19cum14 | Number of cumulative local COVID-19 cases within 14 days | 19.22 | 54.99 | 8.66 | 36.17 |
| COVID19im | Number of imported COVID-19 cases per day | 0.46 | 1.95 | 3.45 | 3.85 |
| GDPd | Average daily GDP (in 100 million yuan) | 102.39 | 10.75 | 108.47 | 11.47 |
| Temperature | Average daily temperature (°C) | 14.49 | 10.96 | 18.63 | 8.29 |
| Precipitation | Total precipitation in a day (mm) | 1.67 | 7.32 | 4.66 | 13.05 |
| Weekend | If a holiday or weekend (=1) | 0.32 | 0.47 | 0.32 | 0.47 |
| LevelI | If a first-level response to major public health emergency (=1) | 0.16 | 0.37 | 0.10 | 0.30 |
| LevelII | If a second-level response to major public health emergency (=1) | 0.12 | 0.32 | 0.08 | 0.26 |