| Value | Category | Cases | |
|---|---|---|---|
| 1 | Official accounts | 147 |
13.8%
|
| 2 | Facility records | 209 |
19.6%
|
| 3 | No source: oral report | 638 |
59.8%
|
| 96 | Others | 73 |
6.8%
|
| Sysmiss | 1 |