Table 1: The correlation coefficient of variable test table.

Input variable

Output Variable 0.993***0.974***0.922***0.993***
0.998***0.959***0.912***0.991***

Environment variable 0.946***0.969***0.941***0.965***
0.952***0.996***0.984***0.990***
0.995***0.960***0.905***0.988***
0.972***0.944***0.875***0.966***
−0.537−0.758**−0.812**−0.666*
0.961***0.958***0.924***0.967***
0.884***0.721**0.617*0.799**

Note: *, ** and *** indicate significance at the 10%, 5% and 1% levels, respectively.