Table 2.

Articles grouped by study type and year.

		Year							Total
		1980	1985	1990	1995	2000	2005	2010
Study Type	Therapeutic	64	82	82	70	68	134	90	590
	Diagnostic	4	7	12	8	8	12	13	64
	Prognostic	23	16	27	19	11	24	41	161
	Economic and Decision Analysis	0	0	0	0	1	3	1	5
Total		91	105	121	97	88	173	145	820