Prevalence of low back pain and associated occupational factors among Chinese coal miners

BMC Public Health

Table 2 Univariate and multivariate analyses for potential occupational factors of LBP in coal miners

	LBP		Univariate analysis(a)		Multivariate analysis(b)
Factors	No(n)	Yes(n)	OR(95%CI)	P	OR(95%CI)	P
Age, years
≤ 25(reference)	151	154
26-35	88	169	1.9(1.3-2.7)	< 0.001	1.8(1.2-2.8)	0.009
36-45	140	276	2.4(1.8-3.2)	< 0.001	2.3(1.4-2.9)	< 0.001
> 46	160	392	1.9(1.4-2.6)	< 0.001	2.1(1.2-2.6)	0.007
Standing for long period
No	218	270	1		1
Yes	322	724	1.2(1.1-1.3)	< 0.001	1.0(0.8-1.3)
Overtime works
No	283	420	1		1
Yes	257	577	1.5(1.2-1.9)	< 0.001	1.1(0.9-1.5)
Exposure to cold temperature
No	185	248	1		1
Yes	349	740	1.6(1.3-2.0)	< 0.001	1.2(0.9-1.5)
Tasks with a high degree of repetitiveness
No	330	515	1		1
Yes	202	466	1.5(1.2-1.8)	< 0.001	1.3(1.0-1.6)	0.034
Performed with arms at or above shoulder level
No	325	505	1		1
Yes	210	447	1.5(1.3-2.0)	0.001	0.9(0.7-1.3)
Tasks characterized by a high level of physical demand ( > 20 kg)
No	286	387	1		1
Yes	249	599	1.8(1.4-2.2)	< 0.001	1.4(1.1-1.8)	0.011
Posture characterized by extreme bending
No	248	313	1		1
Yes	289	670	1.9(1.5-2.3)	< 0.001	1.4(1.0-1.7)	0.025
Posture characterized by extreme twisting
No	289	407	1		1
Yes	243	572	1.6(1.3-2.0)	< 0.001	1.1(0.8-1.4)
Static work posture
No	279	434	1		1
Yes	253	550	1.4(1.1-1.7)	0.002	0.8(0.6-1.2)
Insufficient recovery time
No	199	238	1		1
Yes	331	750	2.0(1.6-2.7)	< 0.001	1.4(1.0-1.8)	< 0.001
Type of work
Surface	250	290	1		1
Underground	290	707	1.4(1.2-1.8)	< 0.001	1.0(0.9-1.5)

ISSN: 1471-2458