Table 3.

Distribution of studies and comparisons according to OA site.

OA site	Number of studies	Number of comparisons	Percent of total comparisons
Hand	6	9	1.4
Hip	24	28	4.5
Hip ​+ ​knee	67	88	14.0
Knee	339	491	78.3
OA	9	10	1.6
Total	445	626