| Value | Category | Cases | |
|---|---|---|---|
| 0 | No | 147 |
29.8%
|
| 1 | Yes | 346 |
70.2%
|
| 996 | Refuse to answer | 0 |
0%
|
| 999 | Don't know what periods are | 0 |
0%
|
| Sysmiss | 1 |