| Value | Category | Cases | |
|---|---|---|---|
| 0 | Not at all. | 3001 |
90.4%
|
| 1 | Several days | 242 |
7.3%
|
| 2 | More than half the days | 23 |
0.7%
|
| 3 | Nearly every day | 52 |
1.6%
|
| Sysmiss | 2670 |