Table 4.

Factors influencing prevalence of MSD last year.

Variables		Prevalence of MSD last year	P	OR	95% CI
					Upper limit	Lower limit
Gender			0.273
	Male	65.20%		1
	Female	70.00%		1.276	0.826	1.973
Age (years)			0.097
	<30	59.60%		1
	30+	63.00%		1.151	0.774	1.714
	40+	68.80%		1.492	1.051	2.118
	50+	64.60%		1.235	0.837	1.821
Years of service			0.001
	<10	58.50%		1
	10+	67.20%		1.457∗	1.068	1.988∗
	20+	69.40%		1.613∗∗	1.241	2.096
Education			0.689
	Junior high school or lower	63.90%		1
	Senior high school or technical secondary	67.00%		1.148	0.881	1.497
	Junior college	66.40%		1.118	0.816	1.532
	Bachelor's degree or higher	68.30%		1.219	0.743	2.000
Shift system			0.002
	Day shift only	67.30%		1
	Two shifts	71.70%		1.226	0.847	1.774
	Two shifts with three groups	60.10%		0.730∗	0.565	0.942
	Three shifts with four groups	74.10%		1.338	0.873	2.205
Significant bending			<0.001
	No	54.10%		1
	Yes	75.10%		2.723∗∗	2.141	3.462
Forward neck tilting			<0.001
	No	53.10%		1
	Yes	76.80%		2.967∗∗	2.337	3.767
Maximum force operation within a short period of time			<0.001
	No	55.00%		1
	Yes	75.30%		2.655∗∗	2.088	3.376
Repeated movement of upper arms or fingers			<0.001
	No	56.80%		1
	Yes	71.90%		1.941∗∗	1.538	2.450
Slip or fall incidents			<0.001
	No	55.00%		1
	Yes	76.20%		2.744	2.155	3.495
Work under conditions of cold or temperature variations			<0.001
	No	52.00%		1
	Yes	74.40%		2.688∗∗	2.121	3.405
Burnout level			0.001
	Zero burnout	67.40%		1
	Mild burnout	66.20%		0.904	0.599	1.365
	Moderate burnout	61.80%		0.743	0.495	1.117
	Severe burnout	84.70%		2.530	1.225	5.099

Note: ^∗P < 0.05; ^∗∗P < 0.01.