| Value | Category | Cases | |
|---|---|---|---|
| 1 | Weekly | 21 |
2.1%
|
| 2 | Monthly | 162 |
15.8%
|
| 3 | Once a term | 396 |
38.7%
|
| 4 | Half a term | 47 |
4.6%
|
| 5 | Yearly | 110 |
10.7%
|
| 6 | Ad hoc | 128 |
12.5%
|
| 8 | Other | 160 |
15.6%
|
| Sysmiss | 548 |