Table 1

Coverage of abstract databases PubMed and EMBASE, and the Cochrane Library
all records since 2000 source
PubMed/MEDLINE (1 Jan 2011)
PubMed records 19,569,568 6,628,156 (1)
Identified clinical trial 457,378 171,025 (1)
Identified randomized controlled trial 293,963 156,496 (1)
Identified meta-analysis 25,723 21,146 (1)
Indexed journals 5,543 1,287 (2) 17 May 2011
EMBASE (17 May 2011)
EMBASE records ∼ 24 M (3)
EMBASE journals ≥ 7,500 (3)
Cochrane library (17 May 2011)
Clinical trials (CENTRAL) 645,086 286,418 (4) issue 2 of 4, Apr 2011
Cochrane reviews 4,621 4,621 (4) issue 5 of 12, May 2011
Other reviews 14,602 12,683 (4) issue 2 of 4, Apr 2011
All reviews (Cochrane + Other) 19,223 17,304
Cochrane protocols 2,020 2,020 (4) issue 5 of 12, May 2011
sources
1. http://www.nlm.nih.gov/bsd/licensee/baselinestats.html webcite
2. http://www.nlm.nih.gov/tsd/serials/lji.html webcite
3. http://embase.com/info/what-is-embase/coverage webcite
4. http://thecochranelibrary.com/ webcite

Valkenhoef et al.

Valkenhoef et al. BMC Medical Informatics and Decision Making 2012 12:95   doi:10.1186/1472-6947-12-95

Open Data