Table 4.

Relationship between independent variables (work vibration) and dependent variables (low frequency/high frequency).

Model 1-2: independent variable	Dependent variable: LFa/HFb
	Estimated	SE	t valuec	P value
Awd	0.0329	0.0079	4.18	<.001
(Intercept)	1.817	0.405	4.49	<.001
Multiple R2e	0.305	—f	—	—
Adjusted R2	0.287	—	—	—
F static valueg	17.5	—	—	<.001

^aLF: low frequency.

^bHF: high frequency.

^ct value: result of the student's t test.

^dAw: vibration indices.

^eR²: coefficient of determination.

^fNot available

^gF static value: variance ratio.