| Value | Category | Cases | |
|---|---|---|---|
| 0 | no net | 1276 |
27.1%
|
| 1 | only treated nets | 3334 |
70.7%
|
| 2 | both treated and untreated nets | 2 |
0%
|
| 3 | only untreated nets | 101 |
2.1%
|
| Sysmiss | 30897 |