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Quality of clinical studies in neurosurgical journals: signs of improvement over three decades.
MedLine Citation:
PMID:  16235674     Owner:  NLM     Status:  MEDLINE    
OBJECT: The aim of this study was to evaluate the quality of clinical studies appearing in neurosurgical journals during three decades. METHODS: Clinical studies published in 1982, 1992, and 2002 in Neurosurgery, Journal of Neurosurgery (JNS), and British Journal of Neurosurgery (BJN) were evaluated. The feature study types were categorized as follows: Type 1, prospective randomized controlled trials (PRCTs); Type 2, other prospective studies; Type 3, retrospective case-controlled and cross-sectional studies; and Type 4, case reports. Among a total of 786 articles, the following study types were identified: Type 1, eight (1%); Type 2, 46 (6%); Type 3, 81 (10%); and Type 4, 651 (83%). Overall, the proportion of study types did not differ among journals. Between 1982 and 2002, increases in the proportion of study Types 1 (0 compared with 2%, respectively), 2 (4 compared with 10%, respectively), and 3 (5 compared with 13%, respectively) and decreases in the proportion of study Type 4 (92 compared with 75%, respectively; p < 0.001) were apparent only in JNS and Neurosurgery (p < 0.01). Between 1982 and 2002, the median number of patients (two compared with 14, respectively) and the mean number of authors per study (3.4 compared with 4.8, respectively) increased (p < 0.001). The JNS had a greater mean number of authors per study than the other journals (p < 0.001). CONCLUSIONS: During the three decades evaluated, case reports remained the predominant study design in these prominent neurosurgical journals, notwithstanding the modest increases in study Types 1 and 2 and the associated escalations in author and patient numbers in the same period.
Kanna K Gnanalingham; James Tysome; Juan Martinez-Canca; Sinan A Barazi
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Publication Detail:
Type:  Evaluation Studies; Journal Article    
Journal Detail:
Title:  Journal of neurosurgery     Volume:  103     ISSN:  0022-3085     ISO Abbreviation:  J. Neurosurg.     Publication Date:  2005 Sep 
Date Detail:
Created Date:  2005-10-20     Completed Date:  2005-11-01     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0253357     Medline TA:  J Neurosurg     Country:  United States    
Other Details:
Languages:  eng     Pagination:  439-43     Citation Subset:  AIM; IM    
Department of Neurosurgery, Charing Cross Hospital, Fulham Palace Road, London, United Kingdom.
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MeSH Terms
Case-Control Studies
Clinical Trials as Topic / standards*
Neurosurgery / standards*,  trends
Publishing / standards*,  trends
Quality Control
Research Design
Retrospective Studies

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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