Table 1.

Reliability and validity analysis of indicators affecting drilling task performance.

Variable	Indicator	Cronbach’s alpha	KMO	Bartlett’s test (P)	Number of indicators
Human	Teamwork	0.807	0.709	0.000	7
	Clear assignment of tasks
	Operation training
	Personal safety awareness
	Personal responsibility consciousness
	Drilling experience
	Engineering construction experience
Tool	Fault and overload warning	0.847	0.740	0.000	9
	Use safety
	Sufficient protective tools
	Easy replacement of parts
	Sufficient vulnerable parts
	Man-aided design
	Man–machine adaptive design
	Sufficient equipment types
	Intact function and appearance
Environment	Less dust	0.845	0.712	0.000	11
	Clean construction site
	Good air quality
	No noise hazard
	Bright light
	Emergency plan and drill
	Sufficient protective materials
	Injury report and timely treatment
	Reasonable safety system
	Reasonable project schedule
	Safety inspection and hidden danger investigation
Total scale		0.920	–	–	27