| Value | Category | Cases | |
|---|---|---|---|
| 0 | no net | 19 |
42.2%
|
| 1 | only treated nets | 26 |
57.8%
|
| 2 | both treated and untreated nets | 0 |
0%
|
| 3 | only untreated nets | 0 |
0%
|
| Sysmiss | 2972 |