| Value | Category | Cases | |
|---|---|---|---|
| -99 | 1 |
0.3%
|
|
| 1 | Hanoi | 230 |
61.8%
|
| 2 | Ho Chi Minh City | 38 |
10.2%
|
| 3 | Northern region | 19 |
5.1%
|
| 4 | Central region | 60 |
16.1%
|
| 5 | Southern region | 5 |
1.3%
|
| 6 | Mekong Delta region | 19 |
5.1%
|
| Sysmiss | 57 |