| Value | Category | Cases | |
|---|---|---|---|
| 0 | no net | 1589 |
28.6%
|
| 1 | only treated nets | 3548 |
63.9%
|
| 2 | both treated and untreated nets | 3 |
0.1%
|
| 3 | only untreated nets | 413 |
7.4%
|
| Sysmiss | 34841 |