| Value | Category | Cases | |
|---|---|---|---|
| -9 | NIU (not in universe) | 23 |
0.8%
|
| 1 | easy to use method | 2339 |
82.9%
|
| 2 | hard to use method | 447 |
15.8%
|
| 98 | don't know | 13 |
0.5%
|
| 9999995 | missing:impute | 0 |
0%
|