| Value | Category | Cases | |
|---|---|---|---|
| 1 | Direct from source | 3758 |
48.8%
|
| 2 | Covered container | 3877 |
50.3%
|
| 3 | Uncovered container | 56 |
0.7%
|
| 4 | 17 |
0.2%
|
|
| 8 | Unable to observe | 0 |
0%
|
| Sysmiss | 46132 |