Impact of PubMed Central on bmj.com

1

• Impact of PubMed Central on bmj.com
• Tony Delamothe
• web editor, bmj.com
• http//bmj.com/misc/talks

tdelamothe_at_bmj.com
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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
5
(No Transcript)
6
PMC traffic unique users, Nov 2002
Via PubMed 52
Not via PubMed 48
(total unique users 100)
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PMC traffic articles, Nov 2002
Elsewhere
bmj.com
48
52
(PMCs total number of full text articles 100)
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Elsewhere
Total number of unique users of bmj.com /month
470 000
Unique users lost to bmj.com/month 3640
9
?
Which option do people choose when a PubMed
abstract links to full text on both bmj.com and
PMC?
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Top referring sites

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

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Where users of BMJ material on PMC come from
20000
18000
16000
14000
Direct
12000
10000
8000
6000
PubMed
4000
2000
0
Jul- 01
Aug- 01
Sep- 01
Oct- 01
Nov- 01
Dec- 01
Jan- 02
Feb- 02
Mar- 02
Apr- 02
May- 02
Jun- 02
Jul- 02
Aug- 02
Sep- 02
Oct- 02
Nov- 02
12
Full text BMJ articles retrieved from PMC
35000
30000
25000
20000
15000
10000
5000
0
Dec- 02
Jul- 01
Aug- 01
Sep- 01
Oct- 01
Nov- 01
Dec- 01
Jan- 02
Feb- 02
Mar- 02
Apr- 02
May- 02
Jun- 02
Jul- 02
Aug- 02
Sep- 02
Oct- 02
Nov- 02
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Articles retrieved/month end total
20
18
16
14
12
Direct
10
8
6
4
2
PubMed
0
Jul- 01
Aug- 01
Sep- 01
Oct- 01
Nov- 01
Dec- 01
Jan- 02
Feb- 02
Mar- 02
Apr- 02
May- 02
Jul- 02
Sep- 02
Oct- 02
Nov- 02
Dec- 02
Aug- 02
Jun- 02
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Conclusions

• Half the people who access full text BMJ articles
  on PMC come to bmj.com
• PMC diverts lt1 of bmj.coms potential users
• Use of BMJ material on PMC is falling