| Value | Category | Cases | |
|---|---|---|---|
| 1 | Light | 2357 |
33.5%
|
| 2 | Medium | 407 |
5.8%
|
| 3 | Heavy | 201 |
2.9%
|
| 4 | Cannot recall | 4 |
0.1%
|
| 5 | None | 4058 |
57.7%
|
| Sysmiss | 459 |