| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. No difficulty | 786710 |
51.8%
|
| 2 | 2. Some difficulty | 199024 |
13.1%
|
| 3 | 3. A lot of difficulty | 100999 |
6.7%
|
| 4 | 4. Unable to do | 181040 |
11.9%
|
| 5 | 5. Do not know | 35308 |
2.3%
|
| 9 | 9. Unspecified | 214692 |
14.1%
|
| Sysmiss | 2900821 |