Five-year institutional bibliometric profiles for 103 US neurosurgical residency programs

Douglas R. Taylor University of Tennessee Health Science Center and 
Departments of Neurosurgery and

Search for other papers by Douglas R. Taylor in
Current site
Google Scholar
PubMed
Close
 MD
,
Garrett T. Venable University of Tennessee Health Science Center and 

Search for other papers by Garrett T. Venable in
Current site
Google Scholar
PubMed
Close
 BSc
,
G. Morgan Jones Departments of Neurosurgery and
Clinical Pharmacy, University of Tennessee;

Search for other papers by G. Morgan Jones in
Current site
Google Scholar
PubMed
Close
 PharmD, BCPS
,
Jacob R. Lepard University of Tennessee Health Science Center and 

Search for other papers by Jacob R. Lepard in
Current site
Google Scholar
PubMed
Close
 MD
,
Mallory L. Roberts University of Tennessee Health Science Center and 

Search for other papers by Mallory L. Roberts in
Current site
Google Scholar
PubMed
Close
 BA
,
Nabil Saleh University of Tennessee Health Science Center and 

Search for other papers by Nabil Saleh in
Current site
Google Scholar
PubMed
Close
 MS
,
Said K. Sidiqi University of Tennessee Health Science Center and 

Search for other papers by Said K. Sidiqi in
Current site
Google Scholar
PubMed
Close
 BSc
,
Andrew Moore University of Tennessee Health Science Center and 

Search for other papers by Andrew Moore in
Current site
Google Scholar
PubMed
Close
 BSc
,
Nickalus Khan Departments of Neurosurgery and

Search for other papers by Nickalus Khan in
Current site
Google Scholar
PubMed
Close
 MD
,
Nathan R. Selden Department of Neurological Surgery, Oregon Health & Science University, Portland, Oregon

Search for other papers by Nathan R. Selden in
Current site
Google Scholar
PubMed
Close
 MD, PhD
,
L. Madison Michael II Departments of Neurosurgery and
Semmes-Murphey Neurologic & Spine Institute, Memphis, Tennessee; and

Search for other papers by L. Madison Michael II in
Current site
Google Scholar
PubMed
Close
 , MD
, and
Paul Klimo Jr. Departments of Neurosurgery and
Semmes-Murphey Neurologic & Spine Institute, Memphis, Tennessee; and

Search for other papers by Paul Klimo Jr. in
Current site
Google Scholar
PubMed
Close
 MD, MPH
Restricted access

Purchase Now

USD  $45.00

JNS + Pediatrics - 1 year subscription bundle (Individuals Only)

USD  $536.00

JNS + Pediatrics + Spine - 1 year subscription bundle (Individuals Only)

USD  $636.00
USD  $45.00
USD  $536.00
USD  $636.00
Print or Print + Online Sign in

OBJECT

Various bibliometric indices based on the citations accumulated by scholarly articles, including the h-index, g-index, e-index, and Google’s i10-index, may be used to evaluate academic productivity in neurological surgery. The present article provides a comprehensive assessment of recent academic publishing output from 103 US neurosurgical residency programs and investigates intradepartmental publishing equality among faculty members.

METHODS

Each institution was considered a single entity, with the 5-year academic yield of every neurosurgical faculty member compiled to compute the following indices: ih(5), cumulative h, ig(5), ie(5), and i10(5) (based on publications and citations from 2009 through 2013). Intradepartmental comparison of productivity among faculty members yielded Gini coefficients for publications and citations. National and regional comparisons, institutional rankings, and intradepartmental publishing equality measures are presented.

RESULTS

The median numbers of departmental faculty, total publications and citations, ih(5), summed h, ig(5), ie(5), i10(5), and Gini coefficients for publications and citations were 13, 82, 716, 12, 144, 23, 16, 17, 0.57, and 0.71, respectively. The top 5 most academically productive neurosurgical programs based on ih(5)-index were University of California, San Francisco, University of California, Los Angeles, University of Pittsburgh, Brigham & Women’s Hospital, and Johns Hopkins University. The Western US region was most academically productive and displayed greater intradepartmental publishing equality (median ih[5]-index = 18, median Ginipub = 0.56). In all regions, large departments with relative intradepartmental publishing equality tend to be the most academically productive. Multivariable logistic regression analysis identified the ih(5)-index as the only independent predictor of intradepartmental publishing equality (Ginipub ≤ 0.5 [OR 1.20, 95% CI 1.20–1.40, p = 0.03]).

CONCLUSIONS

The ih(5)-index is a novel, simple, and intuitive metric capable of accurately comparing the recent scholarly efforts of neurosurgical programs and accurately predicting intradepartmental publication equality. The ih(5)-index is relatively insensitive to factors such as isolated highly productive and/or no longer academically active senior faculty, which tend to distort other bibliometric indices and mask the accurate identification of currently productive academic environments. Institutional ranking by ih(5)-index may provide information of use to faculty and trainee applicants, research funding institutions, program leaders, and other stakeholders.

ABBREVIATION

ACGME = Accreditation Council for Graduate Medical Education.
  • Collapse
  • Expand
  • 1

    Alberts B: Impact factor distortions. Science 340:787, 2013

  • 2

    Aoun SG, , Bendok BR, , Rahme RJ, , Dacey RG Jr, & Batjer HH: Standardizing the evaluation of scientific and academic performance in neurosurgery—critical review of the “h” index and its variants. World Neurosurg 80:e85e90, 2013

    • Crossref
    • PubMed
    • Search Google Scholar
    • Export Citation
  • 3

    Baldock C, , Ma R, & Orton CG: Point/counterpoint. The h index is the best measure of a scientist’s research productivity. Med Phys 36:10431045, 2009

  • 4

    Benway BM, , Kalidas P, , Cabello JM, & Bhayani SB: Does citation analysis reveal association between h-index and academic rank in urology?. Urology 74:3033, 2009

  • 5

    Bornmann L, , Mutz R, , Neuhaus C, & Daniel H: Citation counts for research evaluation: standards of good practice for analyzing bibliometric data and presenting and interpreting results. Ethics Sci Environ Polit 8:93102, 2008

    • Crossref
    • PubMed
    • Search Google Scholar
    • Export Citation
  • 6

    Campbell PG, , Awe OO, , Maltenfort MG, , Moshfeghi DM, , Leng T, & Moshfeghi AA, et al.: Medical school and residency influence on choice of an academic career and academic productivity among neurosurgery faculty in the United States. Clinical article. J Neurosurg 115:380386, 2011

    • Crossref
    • PubMed
    • Search Google Scholar
    • Export Citation
  • 7

    Colaco M, , Svider PF, , Mauro KM, , Eloy JA, & Jackson-Rosario I: Is there a relationship between National Institutes of Health funding and research impact on academic urology?. J Urol 190:9991003, 2013

    • Crossref
    • PubMed
    • Search Google Scholar
    • Export Citation
  • 8

    De Groote SLRR, & Raszewski R: Coverage of Google Scholar, Scopus, and Web of Science: a case study of the h-index in nursing. Nurs Outlook 60:391400, 2012

  • 9

    Dodson MV: Citation analysis: Maintenance of h-index and use of e-index. Biochem Biophys Res Commun 387:625626, 2009

  • 10

    Egghe L: An improvement of the h-index: the g-index. ISSI Newsl 2:89, 2006

  • 11

    Fijalkowski N, , Zheng LL, , Henderson MT, , Moshfeghi AA, , Maltenfort M, & Moshfeghi DM: Academic productivity and its relationship to physician salaries in the University of California Healthcare System. South Med J 106:415421, 2013

    • Crossref
    • PubMed
    • Search Google Scholar
    • Export Citation
  • 12

    Fuller CD, , Choi M, & Thomas CR Jr: Bibliometric analysis of radiation oncology departmental scholarly publication productivity at domestic residency training institutions. J Am Coll Radiol 6:112118, 2009

    • Crossref
    • PubMed
    • Search Google Scholar
    • Export Citation
  • 13

    Hirsch JE: An index to quantify an individual’s scientific research output. Proc Natl Acad Sci U S A 102:1656916572, 2005

  • 14

    Hunt GE, , Cleary M, & Walter G: Psychiatry and the Hirsch h-index: The relationship between journal impact factors and accrued citations. Harv Rev Psychiatry 18:207219, 2010

    • Crossref
    • PubMed
    • Search Google Scholar
    • Export Citation
  • 15

    Kalra RR, & Kestle JR: An assessment of academic productivity in pediatric neurosurgery. J Neurosurg Pediatr 12:262265, 2013

  • 16

    Khan N, , Thompson CJ, , Choudhri AF, , Boop FA, & Klimo P Jr: Part I: The application of the h-index to groups of individuals and departments in academic neurosurgery. World Neurosurg 80:759765, 765.e1765.e3, 2013

    • Crossref
    • PubMed
    • Search Google Scholar
    • Export Citation
  • 17

    Khan NR, , Thompson CJ, , Taylor DR, , Venable GT, , Wham RM, & Michael LM II, et al.: An analysis of publication productivity for 1225 academic neurosurgeons and 99 departments in the United States. J Neurosurg 120:746755, 2014

    • Crossref
    • PubMed
    • Search Google Scholar
    • Export Citation
  • 18

    Lee J, , Kraus KL, & Couldwell WT: Use of the h index in neurosurgery. Clinical article. J Neurosurg 111:387392, 2009

  • 19

    Moed HF: New developments in the use of citation analysis in research evaluation. Arch Immunol Ther Exp (Warsz) 57:1318, 2009

  • 20

    Pagel PS, & Hudetz JA: An analysis of scholarly productivity in United States academic anaesthesiologists by citation bibliometrics. Anaesthesia 66:873878, 2011

    • Crossref
    • PubMed
    • Search Google Scholar
    • Export Citation
  • 21

    Ponce FA, & Lozano AM: Academic impact and rankings of American and Canadian neurosurgical departments as assessed using the h index. J Neurosurg 113:447457, 2010

  • 22

    Poynard T, , Thabut D, , Munteanu M, , Ratziu V, , Benhamou Y, & Deckmyn O: Hirsch index and truth survival in clinical research. PLoS ONE 5:e12044, 2010

  • 23

    Quigley MR, , Holliday EB, , Fuller CD, , Choi M, & Thomas CR Jr: Distribution of the h-index in radiation oncology conforms to a variation of power law: implications for assessing academic productivity. J Cancer Educ 27:463466, 2012

    • Crossref
    • PubMed
    • Search Google Scholar
    • Export Citation
  • 24

    Rad AE, , Brinjikji W, , Cloft HJ, & Kallmes DF: The H-index in academic radiology. Acad Radiol 17:817821, 2010

  • 25

    Spearman CM, , Quigley MJ, , Quigley MR, & Wilberger JE: Survey of the h index for all of academic neurosurgery: another power-law phenomenon?. J Neurosurg 113:929933, 2010

    • Crossref
    • PubMed
    • Search Google Scholar
    • Export Citation
  • 26

    Svider PF, , Choudhry ZA, , Choudhry OJ, , Baredes S, , Liu JK, & Eloy JA: The use of the h-index in academic otolaryngology. Laryngoscope 123:103106, 2013

  • 27

    Svider PF, , Husain Q, , Folbe AJ, , Couldwell WT, , Liu JK, & Eloy JA: Assessing National Institutes of Health funding and scholarly impact in neurological surgery. J Neurosurg 120:191196, 2014

    • Crossref
    • PubMed
    • Search Google Scholar
    • Export Citation
  • 28

    Svider PF, , Pashkova AA, , Choudhry Z, , Agarwal N, , Kovalerchik O, & Baredes S, et al.: Comparison of scholarly impact among surgical specialties: an examination of 2429 academic surgeons. Laryngoscope 123:884889, 2013

    • Crossref
    • PubMed
    • Search Google Scholar
    • Export Citation
  • 29

    Tomei KL, , Nahass MM, , Husain Q, , Agarwal N, , Patel SK, & Svider PF, et al.: A gender-based comparison of academic rank and scholarly productivity in academic neurological surgery. J Clin Neurosci 21:11021105, 2014

    • Crossref
    • PubMed
    • Search Google Scholar
    • Export Citation
  • 30

    Turaga KK, & Gamblin TC: Measuring the surgical academic output of an institution: the “institutional” H-index. J Surg Educ 69:499503, 2012

  • 31

    Venable GT, , Khan NR, , Taylor DR, , Thompson CJ, , Michael LM, & Klimo P Jr: A correlation between National Institutes of Health funding and bibliometrics in neurosurgery. World Neurosurg 81:468472, 2014

    • Crossref
    • PubMed
    • Search Google Scholar
    • Export Citation
  • 32

    Zhang CT: The e-index, complementing the h-index for excess citations. PLoS ONE 4:e5429, 2009

Metrics

All Time Past Year Past 30 Days
Abstract Views 420 420 123
Full Text Views 4059 197 3
PDF Downloads 4520 224 10
EPUB Downloads 0 0 0