| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 1764 |
88.7%
|
| 2 | Once | 90 |
4.5%
|
| 3 | Twice | 49 |
2.5%
|
| 4 | 3-5 times | 30 |
1.5%
|
| 5 | 6-10 times | 18 |
0.9%
|
| 6 | 11-20 times | 16 |
0.8%
|
| 7 | More than 20 times | 18 |
0.9%
|
| Sysmiss | 3 |