Table 3.

Evaluation parameters when extracting common factors for fatigue influencing factors of the “work” dimension^*.

“Work” dimension factor	Number of common factors	Initial eigenvalues			Extract the load sum of squares			Rotational load sum of squares
		Total	Optional variance percentage	Accumulation %	Total	Optional variance percent	Accumulation %	Total	Optional variance percent	Accumulation %
Working status	1	4.738	67.680	67.680	4.738	67.680	67.680	2.345	33.498	33.498
	2	0.618	8.825	76.505	0.618	8.825	76.505	1.976	28.235	61.734
	3	0.543	7.760	84.265	0.543	7.760	84.265	1.577	22.531	84.265
Working conditions	1	8.872	68.247	68.247	8.872	68.247	68.247	3.659	28.146	28.146
	2	0.681	5.239	73.486	0.681	5.239	73.486	3.155	24.266	52.412
	3	0.610	4.689	78.175	0.610	4.689	78.175	2.374	18.261	70.673
	4	0.464	3.572	81.746	0.464	3.572	81.746	1.439	11.073	81.746
Workload	1	2.827	47.116	47.116	2.827	47.116	47.116	1.555	25.922	25.922
	2	1.014	16.904	64.020	1.014	16.904	64.020	1.344	22.401	48.323
	3	0.680	11.340	75.359	0.680	11.340	75.359	1.176	19.607	67.930
	4	0.573	9.551	84.910	0.573	9.551	84.910	1.019	16.980	84.910
Working schedule	1	2.985	49.742	49.742	2.985	49.742	49.742	1.551	25.853	25.853
	2	0.905	15.086	64.828	0.905	15.086	64.828	1.312	21.859	47.712
	3	0.666	11.101	75.929	0.666	11.101	75.929	1.226	20.436	68.148
	4	0.647	10.775	86.704	0.647	10.775	86.704	1.113	18.556	86.704

^*Extraction method: principal component analysis.