| Value | Category | Cases | |
|---|---|---|---|
| 0 | 25 |
22.5%
|
|
| 1 | Once | 28 |
25.2%
|
| 2 | Few times | 36 |
32.4%
|
| 3 | Many times | 21 |
18.9%
|
| 20 | 1 |
0.9%
|
|
| Sysmiss | 710 |