| Value | Category | Cases | |
|---|---|---|---|
| 0 | no incentive | 1169 |
23.6%
|
| 1 | non-monetary incentive | 1291 |
26.1%
|
| 2 | monetary incentive | 1208 |
24.4%
|
| 3 | monetary & non-monetary incentives | 1282 |
25.9%
|