1. Impact of PubMed Central on bmj.com Tony Delamothe web editor, bmj.com http://bmj.com/misc/talks tdelamothe@bmj.com

2. What we are General medical journal - about one third original research articles Published weekly (nearest US analog: JAMA)

3. Our PMC history First original articles posted January 2001 “Old” model (delay = zero) Archive back to February 1998

4. Links back to bmj.com

6. PMC traffic: unique users, Nov 2002 (total unique users =100%) Via PubMed 52% Not via PubMed 48%

7. PMC traffic: articles, Nov 2002 (PMC’s total number of full text articles =100%) Elsewhere bmj.com 48% 52%

8. Elsewhere bmj.com Unique users “lost” to bmj.com/month = 3640 Total number of unique users of bmj.com /month = 470 000

9. Which option do people choose when a PubMed abstract links to full text on both bmj.com and PMC? ?

10. Top referring sites Search engines (various) Other BMJ PG sites HighWire portal freemedicaljournals.com www2.kumc.ed PubMed NEJM PubMed Central

11. Where users of BMJ material on PMC come from PubMed Direct

12. Full text BMJ articles retrieved from PMC

13. Articles retrieved/month end total PubMed Direct

14. Conclusions Half the people who access full text BMJ articles on PMC come to bmj.com PMC “diverts” <1% of bmj.com’s potential users Use of BMJ material on PMC is falling