| Value | Category | Cases | |
|---|---|---|---|
| -1 | True missing | 14 |
0.3%
|
| 1 | Not at all | 2598 |
47.4%
|
| 2 | Several days | 1616 |
29.5%
|
| 3 | More than half the days | 678 |
12.4%
|
| 4 | Nearly every day | 564 |
10.3%
|
| 99 | Refused to answer | 9 |
0.2%
|