| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 1549 |
77.9%
|
| 2 | Once | 140 |
7%
|
| 3 | Twice | 112 |
5.6%
|
| 4 | 3-5 times | 84 |
4.2%
|
| 5 | 6-10 times | 40 |
2%
|
| 6 | 11-20 times | 12 |
0.6%
|
| 7 | More than 20 times | 48 |
2.4%
|
| Sysmiss | 3 |