| Ovid MEDLINE (1950–September week 3 2008) | 426 | 461 | 37 |
| Ovid Healthstar (1966–August 2008) | 407 | 438 | 36 |
| SportDiscuss (1830–Sept 2008) | 519 | 328 | 37 |
| EMBASE (1980 to 2008 Week 38) | 425 | 85 | 38 |
| PubMed (1950–Sept 2008) | 280 | 900 | 41 |
| CINAHL (1982–Sept 2008) | 145 | 8 | 6 |
| Ovid OLDMEDLINE (1950–1965) | 0 | 6 | 0 |
| Cochrane Database of Systematic Reviews (3rd Quarter 2008) | 4 | 0 | 0 |
| ACP Journal Club (1991 to August 2008) | 0 | 0 | 0 |
| Database of Abstracts of Reviews of Effects (3rd Quarter 2008) | 5 | 3 | 0 |
| Cochrane Central Register of Controlled Trials (3rd Quarter 2008) | 11 | 14 | 0 |
| AMED—Allied and complementary medicine (1985 to Sept 2008) | 15 | 7 | 0 |