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 | |||