| Value | Category | Cases | |
|---|---|---|---|
| 1 | Yes, less than month | 55 |
0.5%
|
| 2 | Yes, for a month | 86 |
0.7%
|
| 3 | Yes, for 2-3 months | 236 |
2%
|
| 4 | Never did | 48 |
0.4%
|
| Sysmiss | 11580 |