Table 1. Characteristics of Eligible Trials by Data Sharing.

	Number of Articles			Odds Ratio (95% confidence interval)
	Total	Data Shared	Data Not Shared
TOTAL	85	41 (48%)	44 (52%)
High Impact (> = 25)	12	12 (100%)	0 (0%)	∞ (3.8 to ∞)
Low Impact Journal	73	29 (40%)	44 (60%)
Published 1999–2000	6	5 (83%)	1 (17%)	6.0 (0.6 to 288.5)
Published 2001–2003	79	36 (46%)	43 (54%)
Include a US Author	56	35 (63%)	21 (38%)	6.4 (2.0 to 21.9)
No US Authors	29	6 (21%)	23 (79%)