Table 5.

Radiographic knee osteoarthritis (OA) according to the worst affected knee and compartment among floor layers (n = 134) compared to graphic designers (n = 120)

	Floor layers		Graphic designers
	Total	OA	Total	OA
	N	n (%)	N	n (%)	OR*	95% CI
≤ 49 years	43		7
Tibiofemoral		5 (12)		1 (14)	1.1	0.1–13.1
Patellofemoral		2 (5)		2 (29)	0.1	0.01–1.3
50–59 years	72		73
Tibiofemoral		12 (17)		4 (6)	3.6	1.1–12.0
Patellofemoral		9 (13)		7 (10)	1.3	0.5–3.8
≥ 60 years	19		40
Tibiofemoral		5 (26)		10 (25)	1.9	0.4–7.8
Patellofemoral		1 (5)		12 (30)	0.1	0.01–1.1

Odds ratio (OR) with 95% confidence interval (CI)

* Adjusted for body mass index and knee-straining sports activities