| Value | Category | Cases | |
|---|---|---|---|
| -9 | NIU (not in universe) | 323 |
48.2%
|
| 1 | ever used | 169 |
25.2%
|
| 2 | never used | 178 |
26.6%
|
| 3 | don't know about it | 0 |
0%
|
| 9999995 | missing:impute | 0 |
0%
|