| Value | Category | Cases | |
|---|---|---|---|
| 1 | Complete: Participated in all of the monthly surveys | 198 |
21%
|
| 2 | Partial: Participated in some of them onthly surveys | 474 |
50.3%
|
| 3 | No participation: Did not answer any of the monthly surveys | 271 |
28.7%
|
| Sysmiss | 567 |