Scientometric analysis of literature in various disciplines has been carried out by using primary journals or secondary sources to examine the quantitative aspects of literature growth in a particular field of knowledge. Quantitative measurement of publications, citations and other parameters have been largely applied and used in evaluating scientific research. On review of the literature, it was found that no Scientometrics study has been conducted either at the macro or micro level on the literature in the field of "Spinal Cord Injury". Hence it is proposed to study quantitatively the literature published on Spinal Cord Injury by using the bibliographic database, namely MEDLINE which covered in the Pubmed.
REVIEW OF LITERATURE
There are a number of studies about scientometrics and also several studies on mapping have analyzed allied health journal citations to determine lists of primary journals in their fields. (1-12) The first author of this study used these types of studies and methodology with different co-authors and various fields of medicine. (13-20)
SPINAL CORD INJURY
A spinal cord injury (SCI) is damage to the spinal cord that causes temporary or permanent changes in its function. Symptoms may include loss of muscle function, sensation, or autonomic function in the parts of the body served by the spinal cord below the level of the injury. (21)
AIM OF THE STUDY
The aim of this study is:
To study the Number of literature published in the field of Spinal Cord Injury.
To analyse the publication types of literature published.
To examine the languages covered in the literature.
To find out the country of literature published.
To identify the primary journals and their countries.
The records covered during the year 2008 to 2017 in the field of Spinal Cord Injury in the MEDLINE database, which were covered in the PubMed (www.pubmed.com) was searched and bibliographic details were collected. The retrieved records were converted into FoxPro and loaded in SPSS. The keyword 'Spinal Cord Injury' has used for extracting the number of records available in the above-said database. The data, collected from the source database has analysed by using the bibliometric technique such as Bradford's Law of Scattering to find the primary journals in the field of Spinal Cord Injury. (22)
QUANTUM OF SPINAL CORD INJURY RESEARCH PRODUCTIVITY
The research output of literature of Spinal Cord Injury in the database is presented in Table-1 and noticed that a total of 28303 records in the literature of Spinal Cord Injury. It is also noticed that the maximum number of records (3504) was published during the year 2017, followed by 3287 in the year 2016, 3199 in the year 2015 and 3090 in the year 2014. On the whole, it is observed that there is a gradual increase in Spinal Cord Injury research productivity year after year. (Fig. 1)
PUBLICATION TYPES DISTRIBUTION OF SPINAL CORD INJURY RESEARCH
Table-2 reveals the distribution of the 'Spinal Cord Injury' research output according to various publication types of the MEDLINE database. It was found that Journal Article (41.73%), Research Support, Non-U.S. Gov't (29.74%), Review (13.97%), Research Support, U.S. Gov't, Non-P.H.S. (4.19%), Research Support, N.I.H., Extramural (3.10%), Letter (1.79%), Editorial (0.92%), Randomized Controlled Trial (0.66%), Validation Studies (0.64%), Multicenter Study (0.59%), Introductory Journal Article (0.36%), Comment (0.34%), Observational Study (0.32%), Research Support, U.S. Gov't, P.H.S. (0.31), Video-Audio Media (0.26%), News (0.23%), Published Erratum (0.17%), Practice Guideline (0.11%), Portraits (0.08%), Meta-Analysis (0.07%), Retracted Publication (0.07%), Book Chapter (0.05%), Retraction of Publication (0.04%), Book (0.03%), Congresses (0.03%), Interview (0.03%) and other publication types with minimum percentages. (Fig. 2)
DISTRIBUTION OF LANGUAGES IN THE LITERATURE OF SPINAL CORD INJURY
Table-3 shows the distribution of citations according to language. The table shows that out of a total of 28303 records, 26907 of them were in English language forming 95.07% of the total, followed by Chinese, French, Spanish, German, Japanese, Russian, Portuguese, Polish, Norwegian, Czech, Swedish, Dutch and other languages follow with minimum records. (Fig. 3)
DISTRIBUTION OF RECORDS BY COUNTRY
Table-4 shows the country-wise distribution of 'Spinal Cord Injury' records. The United States has contributed the highest number of records in the study. Next major contribution belongs to England, the Netherlands, Germany, China, Switzerland, India, Ireland, Japan, France, Korea (South), Italy, Sweden, Greece, Scotland, Iran, Australia, Spain, Brazil, United Arab Emirates, Poland, Austria, Turkey, New Zealand, Canada, Russia (Federation), Singapore, Denmark, Egypt, Saudi Arabia, China (Republic: 1949-), Czech Republic, Belgium, Pakistan, Norway, Mexico, Uganda, Romania, Croatia, Thailand, Hungary, Portugal, South Africa, Boca Raton (FL), Israel, Nigeria, Serbia, Bosnia and Herzegovina, Nepal, Argentina, Oman, Finland, Slovakia and other countries with minimum records follows. India records in the 7th position among the countries. (Fig. 4)
DISTRIBUTION OF JOURNALS IN SPINAL CORD INJURY
As per the Bradford Law, the journals were grouped into three zones producing a similar number of articles and also 11812 journal articles were taken for this study. The distribution of journal by zone wise is given in the Table-5, it shows that 29 primary journals grouped in zone-1 published 3941 journal articles accounting for one-third of the total output. Similarly, the second zone comprises of 238 journals published 4031 journal articles and 1790 journals grouped in the third zone published 3840 journal articles. Zone-1 and Zone-2 journals were identified as primary journals in the field of Spinal Cord Injury. (Figure-5)
COUNTRY WISE COVERAGE OF ZONE-1 JOURNALS
Table-6 shows that the most frequently cited journals are United States titles with 41.37%. Of the 29 Journals in zone-1, twelve journals are published in the United States and followed by England (5), China (2), Austria (1), Germany (1), Greece (1), India (1), Ireland (1), Japan (1), Korea (South) (1), Scotland (1), Sweden (1) and Turkey (1). (Fig.-6)
COUNTRY WISE COVERAGE OF ZONE-2 JOURNALS
Table-7 shows that in zone-2; out of 238 journals, 88 frequently cited journals are the United States and followed by the countries, i.e. England (39), Netherlands (21), Germany (13), China (10), Switzerland (9), France (7), India (7), Japan (6), Korea (South) (6), Italy (5), Brazil (4), Iran (3), Belgium (2), Greece (2), New Zealand (2), Pakistan (2), Poland (2), Spain (2), Australia (1), Czech Republic (1), Ireland (1), Russia (Federation) (1), Saudi Arabia (1), Sweden (1), Turkey (1) and Uganda (1). (Fig.-7)
COUNTRY WISE COVERAGE OF ZONE-1 & 2 JOURNALS
Table-8 shows that in zone-1 & 2; out of 267 journals, 100 frequently cited journals are the United States, this is followed by the countries, i.e. England (44), Netherlands (21), Germany (14), China (12), Switzerland (9), India (8), France (7), Japan (7), Korea (South) (7), Italy (5), Brazil (4), Greece (3), Iran (3), Belgium (2), Ireland (2), New Zealand (2), Pakistan (2), Poland (2), Spain (2), Sweden (2), Turkey (2), Australia (1), Austria (1), Czech Republic (1), Russia (Federation) (1), Saudi Arabia (1)...