| Value | Category | Cases | |
|---|---|---|---|
| 0 | None | 2105 |
76.7%
|
| 1 | 1/4 | 528 |
19.2%
|
| 2 | 1/2 | 69 |
2.5%
|
| 3 | 3/4 | 23 |
0.8%
|
| 4 | All or nearly all | 18 |
0.7%
|
| Sysmiss | 2250 |