| Value | Category | Cases | |
|---|---|---|---|
| -1 | True missing | 8 |
0.1%
|
| 0 | Never | 827 |
15.1%
|
| 1 | Rarely | 528 |
9.6%
|
| 2 | sometimes | 2304 |
42.1%
|
| 3 | often | 1800 |
32.9%
|
| 99 | Refused to answer | 12 |
0.2%
|