| Value | Category | Cases | |
|---|---|---|---|
| 1 | Available separately | 218 |
3.4%
|
| 2 | Available but integrated with other devices | 571 |
8.8%
|
| 3 | Available separately and also integrated with other devices | 21 |
0.3%
|
| 4 | Not available | 4881 |
75.1%
|
| 5 | I don't know | 48 |
0.7%
|
| Sysmiss | 761 |