| Value | Category | Cases | |
|---|---|---|---|
| 1 | Light | 2108 |
30.6%
|
| 2 | Medium | 188 |
2.7%
|
| 3 | Heavy | 49 |
0.7%
|
| 4 | Cannot recall | 18 |
0.3%
|
| 5 | None | 4535 |
65.7%
|
| Sysmiss | 588 |