| Value | Category | Cases | |
|---|---|---|---|
| 1 | AC | 19 |
39.6%
|
| 2 | DC | 8 |
16.7%
|
| 3 | Portable | 14 |
29.2%
|
| 888 | Don?t know | 7 |
14.6%
|
| Sysmiss | 233 |