Table 3.

Proportion of knee complaints among floor layers and graphic designers with tibiofemoral (TF) or patellofemoral (PF) osteoarthritis (OA)

	Floor layers						Graphic designers
	TF OA			PF OA			TF OA			PF OA
Age groups	N*	n†	(%)	N*	n†	(%)	N*	n†	(%)	N*	n†	(%)
≤ 49 years	5	3	(60)	2	2	(100)	1	1	(100)	2	1	(50)
50–59 years	12	9	(75)	9	7	(78)	4	4	(100)	7	3	(43)
≥ 60 years	5	2	(40)	1	0	-	10	7	(70)	12	8	(67)

* Attendees in the age group with TF or PF OA

^† Knee complaints during the past 12 months