| Value | Category | Cases | |
|---|---|---|---|
| 1 | Light | 1986 |
28.5%
|
| 2 | Medium | 246 |
3.5%
|
| 3 | Heavy | 88 |
1.3%
|
| 4 | Cannot recall | 34 |
0.5%
|
| 5 | None | 4604 |
66.2%
|
| Sysmiss | 528 |