| Variables | dy/dx | p > z | X |
| Competition 2 | −0.060 (0.015)* | 0.000 | 0.154 |
| Competition 3 | −0.079 (0.014)* | 0.000 | 0.195 |
| Competition 4 | −0.065 (0.014)* | 0.000 | 0.137 |
| Competition 5 | −0.066 (0.015)* | 0.000 | 0.173 |
| Competition 6 | −0.086 (0.015)* | 0.000 | 0.067 |
| Competition 7 | −0.073 (0.021)* | 0.001 | 0.041 |
| Competition 8 | −0.078 (0.021)* | 0.000 | 0.039 |
| Competition 9 | −0.050 (0.034) | 0.138 | 0.016 |
| Competition is harmful | −0.034 (0.036) | 0.339 | 0.018 |