Table 5.

Influencing factors of GLUEUL.

Influencing Factors	Description	References
EDL	GDP per capita (yuan)	Gao et al. [39]
ISU	Tertiary sector as a proportion of secondary sector (%)	Chen et al. [40] Xu et al. [41]
UPS	Number of people in urban areas of the city (10,000)	Liu et al. [42] Li et al. [43]
FS	Local-general-budget expenditure as a proportion of GDP (%)	Tu et al. [44]
FIS	Total output value of foreign-invested enterprises as a proportion of GDP (%)	Luo et al. [45]
FDL	Year-end loan balance as a percentage of GDP (%)	Li et al. [46] Hussain et al. [47]
WL	Average wage of urban workers (yuan)	Wen et al. [48]
GTIA	Number of green patent applications (pcs)	He et al. [49]