Table 2.

Number of cases and controls in each OA type

Study	Classification system	Cut-off value for OA	Exact OA definition	Knee OA		Wrist OA
				Cases	Controls	Cases	Controls
KAREa	K/L score	2	One definite osteophyte (original K ≥2)	167	467	204	467

^aKARE: the Korea Association Resource project.