| Value | Category | Cases | |
|---|---|---|---|
| -1 | True missing | 14 |
0.3%
|
| 1 | Not at all | 3747 |
68.4%
|
| 2 | Several days | 988 |
18%
|
| 3 | More than half the days | 448 |
8.2%
|
| 4 | Nearly every day | 274 |
5%
|
| 99 | Refused to answer | 8 |
0.1%
|