Table 4

Unadjusted and adjusted odds ratios of all factors at baseline for a lower frequency of low back symptom days at follow up

Factors	Unadjusted ORs for each factor						ORs for each factor adjusted for all other factors
	All computer workers			Repetitive work			All computer workers			Repetitive work
	p	OR	90% CI	p	OR	90% CI	p	Adj. OR	90% CI	p	Adj. OR	90% CI
Gender	<0.0001			0.21			0.01			0.71
Women		0.51	0.40–0.66		0.70	0.44–1.11		0.62	0.45–0.86		0.88	0.52–1.52
Age	0.84			0.29			0.63			0.44
40–49 y		1.15	0.88–1.49		1.41	0.99–2.02		1.24	0.91–1.69		1.43	0.94–2.17
30–39 y		1.02	0.78–1.35		1.19	0.82–1.74		1.13	0.81–1.58		1.24	0.80–1.92
18–29 y		1.06	0.68–1.65		1.67	0.96–2.90		1.37	0.80–2.35		1.64	0.84–3.18
% of work time at computer	0.10			0.16			0.80			0.56
75%		1.46	1.10–1.92		1.44	0.94–2.20		1.14	0.81–1.61		1.12	0.69–1.82
50%		1.25	0.93–1.69		0.60	0.30–1.23		1.13	0.77–1.67		0.55	0.22–1.37
0–25%		1.42	0.97–2.07		1.72	0.84–3.55		0.87	0.52–1.47		1.51	0.58–3.95
Adjusted chair	0.17			0.90			0.42			0.87
Yes		1.30	0.95–1.79		1.03	0.69–1.54		1.22	0.82–1.82		0.95	0.56–1.60
Adjusted desk	0.36			0.28			0.56			0.42
Yes		1.17	0.88–1.56		1.32	0.86–2.01		0.15	0.78–1.69		1.33	0.74–2.39
Space for resting the arms in front of keyboard	0.47			0.49			0.11			0.32
Yes		0.90	0.70–1.15		0.86	0.60–1.23		0.73	0.54–1.01		0.76	0.48–1.20
Upper line on screen below eye height	0.17			0.68			0.05			0.21
Yes		1.22	0.96–1.54		1.08	0.79–1.48		1.41	1.06–1.88		1.33	0.91–1.92
Standing work posture	0.07			0.26			0.16			0.33
Seldom–all the time		0.78	0.62–0.98		0.80	0.58–1.11		0.78	0.58–1.04		0.77	0.49–1.20
Glare/reflection	0.08			0.11			0.28			0.22
Now and then–never		1.31	1.02–1.69		1.40	1.00–1.96		1.22	0.90–1.65		1.34	0.90–1.99
Pauses	0.03			0.34			0.88			0.68
Large influence		1.33	1.07–1.65		1.20	0.88–1.63		1.03	0.76–1.39		1.12	0.72–1.74
Speed of work	0.002			0.11			0.04			0.36
Large influence		1.50	1.21–1.86		1.34	0.99–1.80		1.43	1.08–1.89		1.24	0.84–1.83