| Value | Category | Cases | |
|---|---|---|---|
| 0 | No | 18008 |
93.7%
|
| 1 | Often | 177 |
0.9%
|
| 2 | Sometimes | 781 |
4.1%
|
| 3 | Not at all | 163 |
0.8%
|
| 4 | Yes, widow/frequency missing | 93 |
0.5%
|
| 9 | Missing | 167 | |
| Sysmiss | 15207 |