Research on the Relationship between Construction 4.0 and Construction Firm’s Performance: Based on the Mediating Role of Technological Innovation Capability

Table 2

Definition of variables.

	Variables	Variable symbol	Description
Dependent variable	Firm performance	ROE	Return on equity
Independent variable	Construction 4.0	C4	Sourced from text mining
Mediating variable	Technological innovation capability	Inf	Index of technological innovation capability
Control variables	Company age	Age	The natural logarithm of the year the company was founded
	Debt asset ratio	Lev	Total liabilities/total assets
	Contribution of management expenses	Cme	Main business income/administrative expenses
	Total assets turnover	Ttc	Net profit/total average assets