| Value | Category | Cases | |
|---|---|---|---|
| 1 | I have never used | 1909 |
85.6%
|
| 2 | I don't use now | 128 |
5.7%
|
| 3 | Yes | 144 |
6.5%
|
| 4 | No | 50 |
2.2%
|
| Sysmiss | 26 |