Table 1.

Description of basic data with respect to data source

	No. of publications	Follow-up period	Revisions/ primaries (%)	No. of primary cases	No. of revision cases	Observed component years	Revisions per 100 observed component years	CI
Inventor studies	7	9.6	4.3	1,559	67	15,029	0.45	0.35–0.57
Independent clinical studies	13	5.0	6.1	1,445	88	7,205	1.22	0.99–1.50
Total clinical studies	20	7.4	5.2	3,004	155	22,234	0.70	0.60–0.82
Registry-based journal publications	3	9.0	14.5	1,951	283	17,638	1.60	1.43–1.80
Annual registry reports	3	3.5	6.9	11,985	825	42,037	1.96	1.83–2.10