| PPF in PWYW | |||
| Duncana,b,c | |||
| Country | N | Subset | |
| 1 | 2 | ||
| Poland | 72 | 4.042 |
|
| Australia | 77 | 4.494 | 4.494 |
| Germany | 83 | 4.566 | 4.566 |
| USA | 90 |
| 4.989 |
| Sig. |
| 0.072 | 0.089 |