As shown in Table 4 , the single threshold effect of digitalization level is statistically significant at the 10% level with an F-statistic of 23.59, while the double threshold model failed to reach statistical significance.
3
—
—
The sentences
Conversely, when digitalization levels exceed the threshold value (> 0.343), the regression coefficient for green transformation reaches − 1.687 and becomes highly significant at the 1% level.
Regarding the changes in coefficient magnitudes, the absolute values of the core explanatory variable’s coefficients generally exhibit an increasing trend as control variables are incrementally incorporated, while the significance level remains consistently high.