1. PubMed & Impact Factors
Summerschools 2013 Pediatrics &
NeuroScience UMCG
Central Medical Library
July 9th 2013

2. Your teachers this afternoon
Guus van den Brekel & Hans Froon
Email: cmb@umcg.nl
Website library: http://www.rug.nl/umcg/library

3. Content
1. Finding Best Evidence and PubMed
• Excercises
• feedback
2. Impact Factors, H-Index, Top 25% ..
• Excercises
• feedback

4. Finding best evidence & PubMed
PICO approach & Examples
PubMed Tutorials:
From NLM: http://www.nlm.nih.gov/bsd/disted/pubmed.html
•Intro (What is PubMed),
•term mapping,
•Boolean operators,
•MeSH,
•textwords,
•filters

5. PICO(S)
P : Patient or problem
I : Intervention (or risk factor, prognostic factor)
C : Control group (or absence of risk factor, progn.factor)
O : Outcome
(S): Study type
Categories: therapy, diagnosis, etiology, prognosis

6. Example 1
A 30 year old man attends the
emergency department after having
been bitten by a dog 4 hours
previously. He has puncture wounds
and a 1 cm laceration on his forearm.
His wounds are thoroughly cleaned and
a dressing has been applied.
Question: Do you need to prescribe
antibiotics?

7. PICO(S) example 1:
P = (adults with) dog bites
I = antibiotics
C = no antibiotics/ placebo
O = incidence of wound infection
S = randomized controlled trial
•Find search terms and synomyms for every section when needed
•Build your search strategy with Boolean operators

8. PICO(S) example 1:
T
• Dog bite antibiotics
• (dog OR dogs) AND (bite OR bites) AND
(antibiotic OR antibiotics OR penicillin)

9. Boolean Operators (AND, OR, NOT)

10. Example 2
An 5 year-old child has crashed on his bicycle into a
car.
He suffers from abdominal pain, caused by his bike’s
handlebar which thumped into his abdomen.
Question: What is the value of a CT-scan compared
to echography in case of a child with blunt (non-
penetrating) abdominal trauma?

11. PICO(S) example 2
P = child blunt abdominal trauma
I = CT
C = echography
O = (diagnostic value)
(S) = (diagnostische studies)

12. Exercises Finding Best Evidence
1.
You are interested in the effectivity of interventions (such as
cognitive therapy) aimed at the prevention of major
depression recurrence/relapse.
P =
I =
C =
O =
Type of article:

13. Exercises Finding Best Evidence
2.
For adolescents with OCD (obsessive comp. Disorder),
which treatment is more effective to start with: cognitive
behaviour therapy, an anti-depressive agent (SSRI) or a
combination of both treatments?
P =
I =
C =
O =
Type of article:

14. Exercises Finding Best Evidence
3.
Many babies that are breastfed sleep regularly part of the
night in the bed of their parents. Since a couple of years this
is strongly discouraged in guidelines to prevent cot death
(Sudden Infant Death Syndrome). Can you find evidence
that sleeping between the parents is a risk factor for SIDS?
P =
I =
C =
O =
Type of article:

15. Feedback & Questions

16. Top 25%, Impact Factors
and h-index
List top 25% journals per ISI category
http://atumcg.cmb.med.rug.nl
CMB-website: www.rug.nl/umcg/library

17. Impact Factor
 Measure for number of citations to a
journal over a certain period of time
 Quality?
 1975- now : Journal Citation Reports

18. MOLECULAR IMMUNOLOGY
 Cites in 2008 to articles from 2007 resp 2006:
1143 + 800 = 2243 cites
Number of articles in 2007 resp 2006:
407 + 224 = 631
 Impact Factor: 2243/ 631 = 3.555

19. Value
Depends on ISI “Subject Category”
view journal summary list
Top 25%

20. MOLECULAR IMMUNOLOGY
1st
Category:
BIOCHEMISTRY & MOLECULAR BIOLOGY
Ranking based on impact: 89 / 275 = 0.32 (history)
2012 Ranking: 161 / 290 = 0.55
 Outside top 25%

21. MOLECULAR IMMUNOLOGY
2nd
Category:
IMMUNOLOGY
Ranking based on impact: 35 / 121 = 0.29 (history)
• 2012 Ranking: 81 / 135 = 0.60
 Also outside top 25%!

22. Positive
 broad spectrum (9000 journals, 60 countries)
 objective (quantity)
 worldwide known

23. negative
 limited to ISI journals
 subject category dependent
Comparing IFs
Disadvantage specific research area
 influence of “spikes”
Manipulation
IF does not say anything about individual
article

24. Other measures of impact
Journal Immediacy Index (ISI)
Journal Cited Half-Life/ Journal Citing Half-Life
EigenFactor & Article Inluence Score (ISI)
www.eigenfactor.org
SCImago Journal & Country Rank (Scopus)
www.scimagojr.com

25. Output scientists
 bookchapters, thesis
 patents
 conference proceedings
 articles in peer-reviewed journals
 number of publicaties (in top 25%)
 citations, citaties per article
 Hirsch-index

26. Impact authors: citation analysis

27. Citation analyse
 the number of publications
 the number of publications in top 25%
(in relevant ISI-subject categories)
 the number of citations
 h-index
 …

28. Databases
Peer reviewed literature:
 Web of Science (SCI + SSCI)– Thomson ISI
 (Scopus - Elsevier)
 Medline - NLM
 Embase - Elsevier
 coverage>99.9%
Other:
 Repository RUG: thesis
 researchers /PiCarta: book chapters

29. Databases for citation analysis
 Web of Science– Thomson ISI
 Scopus – Elsevier (no access anymore)
Access via CMB website:
http://www.rug.nl/umcg/library
Access to full text & databases from home:
Use your S-number or guest account

30. prof. dr. D.S. Postma
Web of Science (author search)
Postma DS: 587 hits
Excluded: meeting abstracts, notes, corrections
 511 hits (=articles, reviews, editorials,
letters, proceeding papers)

31. prof. dr. D.S. Postma
Web of Science (advanced search)
#1 (AU=Postma DS) AND (OG=gron* OR
OG=beatr*) 529 hits
#2 AU=Postma D AND TS=(immu* OR asthma*
OR lung* OR resp* OR pulm*) AND (OG=gron*
OR OG=beatr*) 23 hits
#3 (#1 OR #2) 552 hits
Excluded: meeting abstracts, notes, corrections
 480 hits (=articles, reviews, editorials,
letters, proceeding papers)

32. Difficult author names
Multiple initials
“Tussenvoegsels”, insertion
Name changes (marriage)
Common names
Voorbeeld: prof. P.E. de Jong
de Jong PE; Dejong PE; Jong PED; de Jong P

33. H-index
J.E. Hirsch (2005)
H-index = n:
author has n publications with n citations or
more
Power: less influence spikes

34. Publishing a lot is not rewarded,
but the publishing of
many higly-cited publications is!

35. Other interesting links
• Google Scholar http://Scholar.google.com
• Publish or Perish (PoP): http://www.harzing.com/pop.htm
• AltMetrics : alternative metrics for impact:
http://altmetrics.org/manifesto/
• 10 Ways to calculate your H-Index : free and otherwise
http://digicmb.blogspot.nl/2013/06/ways-to-calculate-your-h-
index-free-and.html

36. Excercises

37. Exercise 1: Impact Factor
You are working on a systematic review on the prevention of obesity in
young children. You consider to send your your manuscript to the Int J
Pediatr Obes.
•What is the impact factor?
•Is it top25%?
•What are the ISI fields of this journal?
•What would be a good alternative (journal)?

38. Published papers by Simone Times Cites
paper 1 (2012) 0
Paper 2 (2012) 1
Paper 3 (2011) 3
Paper 4 (2010) 5
Paper 5 (2010) 1
Paper 6 (2010) 0
Paper 7 (2009) 15
Paper 8 (2008) 3
Exercise 2: h-index
A young researcher, Simone, has 8
publications. One of her papers, a review, has
been cited 15 times. The sum of the times cited
is 28.
What is the h-index of Simone?

39. Exercise 3: publication and citation overview
Prof. D. Postma is a respected researcher at the department of
Pulmonology.
Her initials are DS (Dirkje S. Postma).
•How many publications of prof. Postma (in combination with the
address field – Groningen) are found in WOS/WOK?
•What is the corresponding h-index?
Compare this to the number of publications in Scholar Google.

40. Feedback & Questions

41. A little extra!
Make life easier!
Use Journal Apps to keep up with
the literature.
BrowZine | Docwise | Read by QxMD
Read more:
http://libguides.rug.nl/medicalEjournals