| Value | Category | Cases | |
|---|---|---|---|
| 0 | Never | 840 |
81.1%
|
| 1 | Once a year | 85 |
8.2%
|
| 2 | Once in 6 months | 41 |
4%
|
| 3 | Once in 2 or 3 months | 35 |
3.4%
|
| 4 | Once a month | 30 |
2.9%
|
| 5 | Several times a month | 5 |
0.5%
|