Barely Significant

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As a sensitivity analysis, we also fit a model containing all candidate predictors without prior selection (Supplementary Table S2); effect estimates were consistent with the main analysis in direction and magnitude, although frailty narrowly missed statistical significance in the full model (aOR: 0.72, 95% CI: 0.51 to 1.02).
All the variables show strong positive correlations that can be accurately represented by polynomial curve fitting techniques, but the FT variable has proved to be an outlier by showing a strong trend of decaying values that can be best estimated using the Inverse model and having the best performance on .
highly significantqualifiedgold
In contrast, the eastern region’s digital economy exhibits highly significant positive direct effects (0.6908***), indirect effects (0.7075**), and total effects (1.3983***) are all highly significantly positive, revealing a dual-engine model of “local-driven + spatial spillover.” This stems from the eastern region’s robust digital infrastructure and efficient factor mobility, where digital technologies deeply integrate with the real economy while data elements and green digital services permeate surrounding areas, highlighting pronounced regional synergies.