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Journal of General Internal Medicine

, Volume 33, Issue 7, pp 1013–1014 | Cite as

Analysis of the Variability of Abstract Structures in Medical Journals

  • Tarek Eid
  • Eric vanSonnenbergEmail author
  • Antoine Azar
  • Porus Mistry
  • Kareem Eid
  • Paul Kang
Concise Research Reports

INTRODUCTION

The abstract is typically the most widely read section of articles, and sometimes the only section that is read.1 It provides readers with an overview of the article without having to read the entire paper. Thus, abstracts should be presented in a manner that will most efficiently deliver the article’s major messages to the reader. This is especially relevant in the medical field, since physicians are required to keep up with the burgeoning literature as it pertains to their chosen specialty or subspecialty.2

In 1987, the Ad Hoc Working Group for Critical Appraisal of the Medical Literature proposed a seven-heading format for structured abstracts in clinical articles.3 Their proposal was further supported by several studies that suggested that structured abstracts were superior to unstructured abstracts, in terms of both quality and the ability to allow readers to select articles more quickly.4,5 However, several subsequent studies questioned the superiority of structured abstracts over unstructured ones.6 Nevertheless, many journals quickly adopted the structured abstract concept soon after it was introduced in 1987.

No large-scale data currently exist on specific abstract format requirements required by individual medical journals for published research articles. This information could be valuable in determining the current trends in abstract structure to help tailor the abstract format to the preference of their readers. Thus, our study was performed to evaluate the abstract format requirements for all English medical journals that publish original articles.

METHODS

Two thousand two hundred thirty-two medical journals were identified from an official database of all verified medical journals cited in Pubmed.

Journals that did not contain original articles and non-English journals were excluded from the study. Thus, 1883 journals were identified as English journals that publish original articles and were included in the study.

We analyzed all 1883 journals to determine whether or not they required authors to include a structured abstract. If the journal required a structured abstract, we then recorded the format of the required structured abstract, the number of headings required in the structured abstract, and the publisher of the journal. This information was collected from the “Instructions to Authors” section from the journals’ websites. The structure of the abstract was determined by the specific combination of required headings. Journal characteristics were assessed using frequencies and proportions.

RESULTS

Of 1883 medical journals analyzed, 1130 (60.1%) required a structured abstract, while 753 (39.9%) did not.

Among the structured abstracts, the number of headings required ranged from 2 to 11; four headings were most commonly required (735 journals) (Table 1).
Table 1

Overall search characteristics in abstracts from 1883 journals

Characteristics

N (%)

Total number of journals included

1883

Structured required

 Yes

1130

(60.1)

 No

753 (39.9)

Number of categories per structure

 1

0 (0)

 2

2 (0.18)

 3

46 (4.1)

 4

735 (66.2)

 5

162 (14.6)

 > 5

111 (10.0)

 Open

74 (6.5)

Number of different structures

314

Number of different headings

154

Total number of publishers

355

Structures: the specific combination of required headings in the abstract. Headings: the specific words to include in the title of each individual section of an abstract

There are a total of 314 different structures required by the individual medical journals. The top ten required structures are listed in Table 2. The most common abstract structure “Background, Methods, Results, Conclusions” is required by 205 (18.8%) journals.
Table 2

Ten most frequent abstract structures stratified by Wiley, Springer, and Elsevier

Structures

Overall

Wiley

Springer

Elsevier

N = 1130

N = 233

N = 237

N = 355

N (%)

N (%)

N (%)

N (%)

Background, methods, results, conclusions

205 (18.8)

81 (34.7)

17 (7.2)

19 (5.3)

Objective, methods, results, conclusions

151 (13.8)

13 (5.6)

2 (0.84)

15 (4.2)

Purpose, methods, results, conclusion

93 (8.5)

4 (1.7)

50 (21.1)

4 (1.1)

Background, objective, methods, results, conclusions

55 (5.0)

4 (1.7)

0 (0)

7 (1.9)

Aims, methods, results, conclusions

44 (4.0)

19 (8.2)

1 (0.86)

3 (0.84)

Open to author

74 (6.5)

2 (0.85)

5 (2.1)

14 (3.9)

Objective, materials and methods, results, conclusions

22 (2.0)

0 (0)

1 (0.86)

5 (1.4)

Purpose, materials and methods, results, conclusions

21 (1.9)

0 (0)

1 (0.86)

4 (1.1)

Introduction, methods, results, conclusions

18 (1.6)

3 (1.3)

1 (0.97)

1 (0.28

Background, results, conclusions

17 (1.6)

0 (0)

4 (3.5)

0 (0)

The abstract structure requirements of the top three publishers, Wiley, Springer, and Elsevier, are described in Table 2. Elsevier publishes 355 (18.9%) of the journals included in the study; their most common abstract structure requirement, “Background, Methods, Results, Conclusions”, is required by only 19 (5.3%) of their journals.

DISCUSSION

The data show that there is a huge variability among medical journal abstract format requirements. Almost two-thirds of journals require a structured abstract, while a little more than one-third do not. Even among the journals that require structured abstracts, 314 different structured abstract formats exist. The data also show that the required abstract format often varies depending on the publisher, although variability even exists within each publisher’s “Instructions to Authors”.

The abstract of a research article describes the overall purpose of the study, the materials or subjects of the study, the methods of the study, the major results of the study, and the implications of those findings specific to the field of the study, all in about 300 words or less. Therefore, to optimize effectiveness, the abstract should be presented in a manner that will most efficiently deliver its message to the reader. Nowhere is this more important than in the medical field, where physicians are required to keep up with the ever-advancing current literature in their respective specialty. Nonetheless, clearly, there is neither standardization nor unanimity on abstract construction, in fact, far from it!

Notes

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

References

  1. 1.
    Pitkin RM. The importance of the abstract. Obstetrics and Gynecology. 1987;70:267PubMedGoogle Scholar
  2. 2.
    Department of Clinical Epidemiology and Biostatistics, McMaster University Health Sciences Centre. How to read clinical journals: Why to read them and how to start reading them critically. Canadian Medical Association Journal. 1981;124:555–558Google Scholar
  3. 3.
    Ad Hoc Working Group for Critical Appraisal of the Medical Literature. A proposal for more informative abstracts of clinical articles. Annals of Internal Medicine. 1987;106:598–604CrossRefGoogle Scholar
  4. 4.
    Taddio A, Pain T, Fassos FF, et al. Quality of nonstructured and structured abstracts of original research articles in the British Medical Journal, the Canadian Medical Association Journal and the Journal of the American Medical Association. Canadian Medical Association Journal. 1994;l150:1611–1615Google Scholar
  5. 5.
    Hartley J, Sydes M, Blurton A. Obtaining information accurately and quickly: Are structured abstracts more efficient? Journal of Information Science. 1996;22:349–356CrossRefGoogle Scholar
  6. 6.
    Hartley J, Sydes M. Are structured abstracts easier to read than traditional ones? Journal of Research in Reading. 2002;20:122–136CrossRefGoogle Scholar

Copyright information

© Society of General Internal Medicine 2018

Authors and Affiliations

  • Tarek Eid
    • 1
  • Eric vanSonnenberg
    • 1
    • 2
    Email author
  • Antoine Azar
    • 1
  • Porus Mistry
    • 1
  • Kareem Eid
    • 3
  • Paul Kang
    • 1
  1. 1.University of Arizona College of Medicine - PhoenixPhoenixUSA
  2. 2.David Geffen School of Medicine at UCLALos AngelesUSA
  3. 3.Miller School of Medicine at the University of MiamiMiamiUSA

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