| Value | Category | Cases | |
|---|---|---|---|
| 0 | None | 768 |
95.3%
|
| 1 | 1/4 | 19 |
2.4%
|
| 2 | 1/2 | 6 |
0.7%
|
| 3 | 3/4 | 6 |
0.7%
|
| 4 | All or nearly all | 7 |
0.9%
|
| 9 | Do not know | 0 |
0%
|
| Sysmiss | 4187 |