Table 3 Self-reported knee complaints of floor layers who used the new working methods (by users of ⩾1 year and <1 year) comparing floor layers who did not report knee problems in 2003 (n = 98) with those who did (n = 117)

Knee complaints in 2005	No knee complaints 2003 (n = 98)				Knee complaints 2003 (n = 117)
	Use the new working methods	n (%)	Unadjusted	Adjusted*	Use the new working methods	n (%)	Unadjusted	Adjusted*
	<1 year (n = 65)		OR (95% CI)	OR (95% CI)	<1 year (n = 42)		OR (95% CI)	OR (95% CI)
	⩾1 year (n = 33)		OR (95% CI)	OR (95% CI)	⩾1 year (n = 75)		OR (95% CI)	OR (95% CI)
>30 days	<1 year	5 (15.6)	1.76 (0.49 to 6.28)	2.03 (0.52 to 7.87)	<1 year	19 (45.2)	2.07 (0.93 to 4.63)	2.46 (1.03 to 5.83)
>30 days	⩾1 year	6 (9.4)			⩾1 year	21 (28.0)
Moderate–severe knee pain	<1 year	13 (39.4)	2.32 (0.93 to 5.8)	2.72 (1.02 to 7.26)	<1 year	24 (57.1)	0.84 (0.37 to 1.83)	0.85 (0.38 to 1.92)
Moderate–severe knee pain	⩾1 year	14 (21.5)			⩾1 year	45 (60.0)
Locking	<1 year	6 (18.2)	2.62 (0.74 to 9.35)	3.13 (0.82 to 12.0)	<1 year	14 (33.3)	2.62 (1.04 to 6.56)	2.89 (1.11 to 7.5)
Locking	⩾1 year	5 (7.7)			⩾1 year	12 (16.0)

*Adjusted for age, BMI, self-reported stress.