| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. No difficulty | 639461 |
42.1%
|
| 2 | 2. Some difficulty | 221314 |
14.6%
|
| 3 | 3. A lot of difficulty | 123669 |
8.1%
|
| 4 | 4. Unable to do | 260539 |
17.2%
|
| 5 | 5. Do not know | 55943 |
3.7%
|
| 9 | 9. Unspecified | 216847 |
14.3%
|
| Sysmiss | 2900821 |