| Item |
| t-test | P |
| Size | New Zealand’s cardioid | 1.859 | <0.001 |
|
| United States’ heart | 1.859 | <0.001 |
| Shape |
| T2 | P (parametric) |
|
| New Zealand’s cardioid | 6.34E−24 | 1 |
|
| United States’ heart | 3.95E−24 | 1 |