| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.2%
|
| 1 | Never | 118 |
19.6%
|
| 2 | Rarely | 143 |
23.8%
|
| 3 | Sometimes | 238 |
39.6%
|
| 4 | Frequently | 101 |
16.8%
|