| Value | Category | Cases | |
|---|---|---|---|
| 1 | None | 3350 |
79.3%
|
| 2 | Both | 142 |
3.4%
|
| 3 | Brother only | 520 |
12.3%
|
| 4 | Sister only | 53 |
1.3%
|
| 5 | Don't know | 162 |
3.8%
|
| Sysmiss | 32 |