| Value | Category | Cases | |
|---|---|---|---|
| 0 | Never | 377 |
9.9%
|
| 1 | Once a year | 166 |
4.3%
|
| 2 | 2-3 times per year | 561 |
14.7%
|
| 3 | Once per term | 594 |
15.5%
|
| 4 | Once per month or more often | 2123 |
55.6%
|