| Value | Category | Cases | |
|---|---|---|---|
| -1 | True missing | 14 |
0.3%
|
| 1 | Not at all | 2960 |
54%
|
| 2 | Several days | 1734 |
31.6%
|
| 3 | More than half the days | 458 |
8.4%
|
| 4 | Nearly every day | 300 |
5.5%
|
| 99 | Refused to answer | 13 |
0.2%
|