| Value | Category | Cases | |
|---|---|---|---|
| 0 | No | 18958 |
98.6%
|
| 1 | Often | 42 |
0.2%
|
| 2 | Sometimes | 124 |
0.6%
|
| 3 | Not at all | 81 |
0.4%
|
| 4 | Yes, widow/frequency missing | 15 |
0.1%
|
| 9 | Missing | 169 | |
| Sysmiss | 15207 |