| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. No difficulty | 654927 |
43.2%
|
| 2 | 2. Some difficulty | 205878 |
13.6%
|
| 3 | 3. A lot of difficulty | 128291 |
8.5%
|
| 4 | 4. Unable to do | 265109 |
17.5%
|
| 5 | 5. Do not know | 49261 |
3.2%
|
| 9 | 9. Unspecified | 214307 |
14.1%
|
| Sysmiss | 2900821 |