| Value | Category | Cases | |
|---|---|---|---|
| 1 | Once | 3 |
21.4%
|
| 2 | Daily | 3 |
21.4%
|
| 3 | Weekly | 3 |
21.4%
|
| 4 | Monthly | 1 |
7.1%
|
| 5 | Per term / semester | 4 |
28.6%
|
| 88 | Other | 0 |
0%
|
| Sysmiss | 15151 |