| Value | Category | Cases | |
|---|---|---|---|
| -1 | True missing | 14 |
0.3%
|
| 1 | Not at all | 3194 |
58.3%
|
| 2 | Several days | 1391 |
25.4%
|
| 3 | More than half the days | 550 |
10%
|
| 4 | Nearly every day | 319 |
5.8%
|
| 99 | Refused to answer | 11 |
0.2%
|