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Published on: January 3, 2017
Determinants of journal impact factors in 'Nutrition and Dietetics'
1Nottingham Digestive Diseases Centre, Division of Translational Medical Sciences, School of Medicine, University of Nottingham, Nottingham, United Kingdom; National Institute for Health Research (NIHR) Nottingham Biomedical Research Centre, Nottingham University Hospitals NHS Trust and University of Nottingham, Queen's Medical Centre, Nottingham, United Kingdom; MRC Versus Arthritis Centre for Musculoskeletal Ageing Research, School of Life Sciences, University of Nottingham, Queen's Medical Centre, Nottingham, United Kingdom; Division of Surgery, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
Background And Aim:
The aim of this cross-sectional study was to analyse determinants of the 2023 impact factors (IFs) of journals within the field of 'Nutrition and Dietetics'.
Methods:
The Clarivate™ Journal Citation Reports™ website (https://jcr.clarivate.com/jcr/home) was searched on 9 January 2025 for journals with a 2023 IF (published in June 2024) ≥ 6.0 in the field of 'Nutrition and Dietetics'. Analysis was performed using GraphPad Prism software.
Results:
There were there were 84,040 citations in 2023 to 10,719 works published in 2021 and 2022 in the 12 journals with an IF ≥ 6.0. Median numbers of citations per output were lower than mean citations in all journals. This difference ranged from 0.55 to 3.97. Most outputs (47.5%-79.1 %) had 1-10 citations. The 1538 open access outputs were cited less frequently [mean (95 % CI) 6.98 (6.55-7.40)] than the 9181 subscription outputs [7.99 (7.81-8.16), P < 0.0001]. The 2063 reviews were cited more frequently [8.94 (8.45-9.43)] than the 8656 original articles [7.58 (7.42-7.74), P < 0.0001]. When the highest cited outputs from each journal were excluded, the fall in IFs ranged from 0 to 2.4. The was also the case when the two highest cited outputs were excluded (fall ranged from 0 to 2.7).
Conclusion:
This comprehensive analysis of journal IFs has shown that although review articles increase IFs of journals, open access outputs do not. IFs can be distorted by 1 or 2 highly cited outputs and may not reflect the impact of the majority of outputs.
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