Table 3.

Associations between physical work load and fear-avoidance beliefs on LBP. Cases with previous LBP

		1-7 days of LBP			8-30 days of LBP			> 30 days of LBP
Model A		P-value	OR	CI 95%	P-value	OR	CI 95%	P-value	OR	CI 95%
Physical work load	High	0.012	1.92	1.15-3.22	0.00	2.88	1.75-4.72	0.00	3.47	2.05-5.87
	Medium	0.01	1.93	1.17-3.16	0.004	2.07	1.27-3.40	0.00	2.80	1.67-4.72
	Low	-	-	-	-	-	-	-	-	-
	FAB-work	0.131	1.21	0.95-1.54	0.023	1.13	1.04-1.65	0.00	1.53	1.21-1.93
Physical work load	High	0.008	1.87	1.18-2.97	0.00	2.45	1.60-3.87	0.00	3.37	2.11-5.36
	Medium	0.03	1.98	1.27-3.10	0.003	1.93	1.25-3.00	0.00	2.77	1.75-4.41
	Low	-	-	-	-	-	-	-	-	-
	FAB-ph.activity	0.322	1.10	0.91-1.40	0.405	1.08	0.90-1.31	0.012	1.28	1.06-1.56
Model B
Physical work load	High	0.045	1.76	1.01-3.07	0.00	2.93	1.70-5.06	0.00	3.08	1.74-5.45
	Medium	0.013	1.97	1.15-3.37	0.001	2.44	1.42-4.19	0.00	3.05	1.74-5.35
	Low	-	-	-	-	-	-	-	-	-
	FAB-work	0.104	1.24	0.96-1.61	0.038	1.31	1.02-1.69	0.00	1.59	1.23-2.04
Physical work load	High	0.072	1.59	0.96-2.62	0.00	2.41	1.48-3.95	0.00	2.90	1.74-4.83
	Medium	0.011	1.86	1.15-3.00	0.002	2.01	1.30-3.39	0.00	2.80	1.71-4.61
	Low	-	-	-	-	-	-	-	-	-
	FAB-ph.activity	0.734	1.04	0.84-1.28	0.584	1.06	0.86-1.30	0.03	1.26	1.02-1.55

Model A: No adjustments

Model B: Adjusted for age, smoking, leisure time physical activity, body mass index, emotional job demands and influence at work