| Interactions | Equation | R2 | p-value |
| UB - Pn | y = 0.4271x − 0.3569 | 0.98 | 0.009 |
| Pn - WD | y = 128.28x + 257.25 | 0.99 | 0.000 |
| WD - WA | y = 0.451x − 338.33 | 0.95 | 0.023 |
| WA - WL | y = 0.0724x + 9.5464 | 0.96 | 0.021 |