| Value | Category | Cases | |
|---|---|---|---|
| 1 | all year | 141 |
47.2%
|
| 2 | last semester | 57 |
19.1%
|
| 3 | last 2 months | 38 |
12.7%
|
| 4 | last month | 9 |
3%
|
| 5 | intermittent | 26 |
8.7%
|
| 6 | summer vacation | 28 |
9.4%
|
| Sysmiss | 25654 |