Table 6

Multivariate analysis of self reported risk factors and low back pain in past 12 months

Risk factor	Low back pain PR (95% CI)	Chronic low back pain PR (95% CI)	Severe low back pain PR (95% CI)	Low back pain and perceived disability PR (95% CI)
Age
<35	1.00	1.00	1.00	1.00
35–44	0.99 (0.82 to 1.20)	1.31 (0.82 to 2.07)	1.17 (0.80 to 1.71)	0.80 (0.47 to 1.36)
45⩾	0.98 (0.80 to 1.19)	1.37 (0.80 to 2.24)	1.28 (0.82 to 2.02)	0.97 (0.56 to 1.68)
High manual handling of materials	1.28 (1.06 to 1.54)^6-150	NS	NS	NS
High strenuous arm positions	NS	NS	NS	2.05 (1.21 to 3.49)^6-150
Many awkward back postures	NS	NS	1.52 (1.03 to 2.26)^6-150	NS
High perceived exertion	NS	2.05 (1.19 to 3.53)^6-150	NS	NS
High job demands	1.23 (1.02 to 1.47)^6-150	NS	1.94 (1.29 to 2.92)^6-150	NS
High need for recovery	NS	NS	1.84 (1.19 to 2.83)^6-150	NS
Moderate perceived general health	1.37 (1.14 to 1.63)^6-150	2.74 (1.74 to 4.31)^6-150	NS	2.45 (1.56 to 3.85)^6-150