Table 1.

The operational definition and assignment of variables.

Types	Variables	Sub-variables	Assignment rules	Assignment	Assignment support
Outcome variables	Severity of production safety accidents	–	MPSAs	1	Investigation report facts
			OPSAs	0
Condition variables	Individual factors	Production behavior	Irregular production and operation errors	1	Investigation report facts
			Production behavior meeting production requirements	0
	Technical factors	Technical Requirements	The accident subject meets the production technical requirements	1	Query through enterprise information website
			The accident subject does not meet the production technical requirements	0
		Safety management capability	Meet safety management capability	1	Investigation report facts
			No safety management capability	0
	Management factors	Response and disposal capability	Time from the occurrence of the accident to the end of the disposal	1	Assign values based on Quartiles
				0.01
	Environmental factors	External supervision	Number of regulatory policies in the 3 years before the accident	1	Assign values based on quartiles
				0.01