| Value | Category | Cases | |
|---|---|---|---|
| 0 | No | 18737 |
97.5%
|
| 1 | Often | 61 |
0.3%
|
| 2 | Sometimes | 296 |
1.5%
|
| 3 | Not at all | 83 |
0.4%
|
| 4 | Yes, widow/frequency missing | 32 |
0.2%
|
| 9 | Missing | 180 | |
| Sysmiss | 15207 |