| Value | Category | Cases | |
|---|---|---|---|
| 1 | Several times a term | 18 |
24.7%
|
| 2 | Once a term | 28 |
38.4%
|
| 3 | Once a year | 4 |
5.5%
|
| 4 | Never | 0 |
0%
|
| 5 | missing | 0 |
0%
|
| 6 | other | 0 |
0%
|
| 7 | refusal | 0 |
0%
|
| 8 | dtk | 0 |
0%
|
| 9 | na | 23 |
31.5%
|