Table A2.

Ordinal logistic regression modelling on accumulated fatigue with multiple work status measurements.

Variables	β	95% Confidence Interval		Wald	OR	p
		Lower	Upper
Threshold
(Level I)	−5.690	−6.271	−5.108	367.871		<0.001
(Level II)	−3.858	−4.412	−3.303	185.985		<0.001
(Level III)	−1.277	−1.800	−0.754	22.940		<0.001
Gender
Men	−0.120	−0.307	0.066	1.596	0.887	0.206
Women	Reference
Age (years)
>45	0.188	−0.242	0.618	0.737	1.207	0.391
30–45	−0.011	−0.285	0.264	0.006	0.989	0.939
<30	Reference
Professional title
Senior	0.330	−0.171	0.830	1.666	1.391	0.197
Middle	0.422	0.005	0.839	3.930	1.525	0.047
Early career	0.090	−0.260	0.440	0.253	1.094	0.615
No professional title	Reference
Monthly salary (yuan)
>8000	−0.799	−1.114	−0.483	24.596	0.450	<0.001
5000–8000	−0.365	−0.590	−0.140	10.127	0.694	0.001
<5000	Reference
Location
Eastern	−0.435	−0.668	-0.203	13.478	0.647	<0.001
Central	−0.401	−0.630	-0.173	11.857	0.670	0.001
Western	Reference
Overwork in one month
Less or appropriate	−0.770	−1.160	−0.380	14.948	0.463	<0.001
Much	−0.686	−0.979	−0.394	21.149	0.504	<0.001
Very much	Reference
Irregular work
Less	−0.206	−0.488	0.075	2.067	0.814	0.150
Much	Reference
Burden on business travel
No or less	−0.026	−0.301	0.249	0.035	0.974	0.851
Much	Reference
Burden on working late at night
Less or appropriate	−0.146	−0.567	0.275	0.462	0.864	0.497
Much	−0.069	−0.417	0.279	0.153	0.933	0.696
Very much	Reference
Rest time
Satisfied	−0.494	−0.787	−0.201	10.911	0.610	0.001
Dissatisfied	Reference
Mental burden of work
Little	−1.450	−1.974	−0.926	29.381	0.235	<0.001
Much	−0.688	−1.083	−0.292	11.596	0.503	0.001
Very much	Reference
Physical burden of work
Little	−1.402	−1.920	−0.885	28.241	0.246	<0.001
Much	−0.587	−1.001	−0.173	7.722	0.556	0.005
Very much	Reference

* The symptom scores of accumulated fatigue were summed up and classified into four levels: I (0-4); II (5-10), III (11-20), IV (>20).