Table 1.

Sample characteristics of preserved and lesioned OA articular cartilage in the Research Arthritis and Articular Cartilage study^a

Tissue type	No. of samples	Age, mean ± SD years	No. of men	No. of women	OA articular cartilage
					Preserved	Lesioned	Preserved–lesioned pairs
Knee	25	69 ± 9	4	21	22	18	15
Hip	22	66 ± 9	5	17	20	8	6
All	47	68 ± 9	9	38	42	26	21

^aOA = osteoarthritic.