| Value | Category | Cases | |
|---|---|---|---|
| 1 | AC | 27 |
38%
|
| 2 | DC | 16 |
22.5%
|
| 3 | Portable | 21 |
29.6%
|
| 888 | Don?t know | 7 |
9.9%
|
| Sysmiss | 210 |