| Value | Category | Cases | |
|---|---|---|---|
| 1 | AC | 15 |
44.1%
|
| 2 | DC | 7 |
20.6%
|
| 3 | Portable | 9 |
26.5%
|
| 888 | Don?t know | 3 |
8.8%
|
| Sysmiss | 247 |