Table 7.

Ridge regression analysis results of workload and its dimensions on miners’ unsafe state.

	Beta	t	p	R2	Adjust R2	F
Constant	–	21.485	0.000**	0.016	0.006	1.636 (p = 0.000)
Workload	0.051	1.675	0.004**
Work time	0.042	1.532	0.043*
Work demand	0.049	2.347	0.017*

Beta represents standardized regression coefficient. t represents a test value for each independent variable one by one. p represents the significance value.

*Represents a significant level at p < 0.05.

**Represents a significant level at p < 0.01. R² is the square of the multivariate correlation coefficient. F represents the analysis of variance test statistic.