| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 4030 |
89.4%
|
| 2 | Once | 67 |
1.5%
|
| 3 | Twice | 70 |
1.6%
|
| 4 | 3-5 times | 76 |
1.7%
|
| 5 | 6-10 times | 54 |
1.2%
|
| 6 | 11-20 times | 28 |
0.6%
|
| 7 | More than 20 times | 125 |
2.8%
|
| 8 | Not applicable | 15 |
0.3%
|
| Sysmiss | 41 |