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Table 1 Results of screening for randomized clinical trials from 2005 to 2012

From: The quality of reports of randomized clinical trials on traditional Chinese medicine treatments: a systematic review of articles indexed in the China National Knowledge Infrastructure database from 2005 to 2012

  2005 2006 2007 2008 2009 2011 2012
Records identified through database searching 2040 2142 2795 3595 3706 6072 5874
Duplicated papers 3 6 6 22 80 24 83
Reviews 347 387 609 773 717 1176 1255
Experience 148 146 209 242 275 785 530
Literature analysis 30 36 26 39 59 93 72
Animal experiments 22 20 17 20 18 15 12
Not randomized 512 540 648 679 772 1083 1076
Retrospective study 3 13 16 25 17 23 86
Case report 20 38 47 80 77 189 156
Others 244 257 548 704 648 1342 1085
Full-text articles assessed for eligibility 711 699 669 1011 1043 1342 1519
Studies included in final review 711 699 669 1011 1043 1342 1519