Table 3

Hierarchical multiple regression results of fatigue

Variables	Step1		Step2		Step3
Variables	β	VIF	β	VIF	β	VIF
Age (years)	0.059	2.776	0.064	2.779	0.027	2.801
Marital status	0.027	1.225	0.02	1.227	0.02	1.228
Education1	0.131**	1.952	0.121**	1.953	0.105**	1.966
Education2	0.102*	2.044	0.099*	2.044	0.092*	2.046
Income1	0.073	2.208	0.059	2.228	0.038	2.242
Income2	0.012	2.85	0.012	2.87	−0.001	2.881
Income3	0.051	3.012	0.063	3.031	0.058	3.039
Workplace1	0.077*	1.273	0.087**	1.278	0.067*	1.302
Workplace2	0.111**	1.439	0.093**	1.444	0.085*	1.453
Weekly work time (hours)	0.065*	1.037	0.053	1.043	0.024	1.087
Occupational allowance	0.062	1.227	−0.039	1.236	−0.03	1.238
Fighting the COVID-19 on the front line	0.091**	1.049	0.076*	1.059	0.059*	1.073
Postcompetency			−0.151**	1.063	0.009	1.474
Respect1			−0.171**	1.502	−0.129**	1.538
Respect2			−0.182**	1.514	−0.129**	1.55
ERR					0.166**	1.143
Resilience					−0.104*	3.326
Self-efficacy					−0.22**	3.263
F	6.268**		9.789**		15.393**
Adjusted R²	0.058		0.115		0.203
ΔR²	0.07		0.058		0.089

Marital status, married/cohabiting vs unmarried/ divorced/separated/widowed; education1, bachelor vs junior college or lower; education2, master or higher vs junior college or lower; income1, ¥3001–¥4000 vs ≤¥3000; income2, ¥4001–¥5000 vs ≤¥3000; income3, >¥5000 vs ≤¥3000; ¥1=US$0.146 (9 July 2020); workplace1, county vs district; workplace2, city vs district; weekly work time (hours), >40 hours/week vs ≤40 hours/week; occupational allowance, yes vs no; working on front line to defeat the COVID-19, yes vs no; respect1, general vs low; respect2, high vs low.
*P<0.05, **p<0.01.
ERR, effort–reward ratio; VIF, variance inflation factor.