| Value | Category | Cases | |
|---|---|---|---|
| 1 | No flashcards | 416 |
17.5%
|
| 2 | Poor quality, up-to-date, but not relevant | 202 |
8.5%
|
| 3 | Average quality, up-to-date, and relevant | 1009 |
42.4%
|
| 4 | Good quality, up-to-date and relevant | 753 |
31.6%
|
| Sysmiss | 947 |