| Value | Category | Cases | |
|---|---|---|---|
| -1 | True missing | 14 |
0.3%
|
| 1 | Not at all | 3542 |
64.6%
|
| 2 | Several days | 1104 |
20.1%
|
| 3 | More than half the days | 507 |
9.3%
|
| 4 | Nearly every day | 302 |
5.5%
|
| 99 | Refused to answer | 10 |
0.2%
|