| Value | Category | Cases | |
|---|---|---|---|
| 0 | measured | 3940 |
99.6%
|
| 3 | not present | 3 |
0.1%
|
| 4 | refused | 10 |
0.3%
|
| 6 | other | 2 |
0.1%
|
| Sysmiss | 8994 |