Prevalence of randomised controlled trials by journal and year of publication
| 2006–2007 | 2008–2009 | 2010–2011 | 2012–2013 | 2014–2015 | p for trend* | ||||||
| Total | 3.8 | (43/1121) | 2.4 | (34/1415) | 4.1 | (63/1544) | 4.3 | (65/1507) | 3.1 | (47/1530) | 0.751 |
| Circulation Journal | 3.9 | (22/566) | 3.3 | (18/546) | 3.7 | (20/547) | 6.1 | (33/539) | 2.9 | (14/481) | 0.669 |
| Heart and Vessels | 7.9 | (8/101) | 3.5 | (4/115) | 6.4 | (10/156) | 3.6 | (6/165) | 3.8 | (7/185) | 0.182 |
| Hypertension Research | 0.4 | (1/252) | 1.1 | (4/376) | 2.5 | (8/321) | 1.1 | (3/263) | 3.4 | (8/234) | 0.017 |
| International Heart Journal | 7.5 | (10/133) | 4.1 | (5/121) | 4.5 | (6/132) | 3.2 | (4/126) | 2.5 | (4/157) | 0.045 |
| Journal of Atherosclerosis and Thrombosis | 2.9 | (2/69) | 0.8 | (1/126) | 4.3 | (10/235) | 3.3 | (6/183) | 4.4 | (9/203) | 0.226 |
| Journal of Cardiology | 1.5 | (2/131) | 5.9 | (9/153) | 5.6 | (13/231) | 1.9 | (5/270) | 0.644 | ||
Values are expressed as percentages (numbers) unless indicated otherwise.
*Comparisons between the five groups were evaluated with the Cochran-Armitage trend test.