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Table 4 Frequency and percentage of trials in the gold standard set that were clearly identified as cluster randomized in the title or abstract, by year of publication.

From: Electronic search strategies to identify reports of cluster randomized trials in MEDLINE: low precision will improve with adherence to reporting standards

Year of publication Identified as CRT Not
identified
Total
2000 4 (28.6%) 10 (71.4%) 14
2001 1 (6.3%) 15 (93.8%) 16
2002 1 (11.1%) 8 (88.9%) 9
2003 10 (52.6%) 9 (47.4%) 19
2004 8 (53.3%) 7 (46.7%) 15
2005 13 (65.0%) 7 (35.0%) 20
2006 30 (57.7%) 22 (42.3%) 52
2007 11 (64.7%) 6 (35.3%) 17
Total 78 (48.1%) 84 (51.9%) 162
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