| Value | Category | Cases | |
|---|---|---|---|
| 0 | control | 253 |
6%
|
| 1 | encouragement | 1340 |
31.9%
|
| 2 | incentive, conditional | 1288 |
30.6%
|
| 3 | incentive, unconditional | 1322 |
31.5%
|