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TMR Integrative Nursing  2018, Vol. 2 Issue (3): 101-107    DOI: 10.12032/TMRIN20180709
Methodology assessment     
Methodologic quality of systematic reviews and meta-analyses on the Mediterranean diet and cognitive function: a review
Yuan Jia1, Si-Yuan Yang1, Li-Ming Guo1, Qian Wu1, Fan-Jie Meng2,*()
1Graduate College, Tianjin University of Traditional Chinese Medicine, Tianjin, China
2Teacher Evaluation and Development Center, Tianjin University of Traditional Chinese Medicine, Tianjin, China.
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Abstract  

Highlights:

This article summarizes the systematic assessment and meta analysis of the impact of existing Mediterranean-style diets on cognitive function and evaluates the methodological quality, providing strong evidence for the development of related work and standardizing the research process and methods in this field.

Editor’s Summary

Systematic review has been the effective tool of summarizing the available best evidence; however, the quality of methodology is a positive association with the value of evidence which will be used to inform decision-making. Consequently, this article assesses the methodology of all available systematic reviews of investigated the role of Mediterranean diet in cognitive function.

Abstract

Background and aim: Several systematic reviews and meta-analyses published within the past years have examined the associations of Mediterranean-style diets (MedSDs) on cognitive. However, these reviews have not been evaluated for satisfying Contemporary methodologies quality standards. At the same time, due to the high demand for related care during the aging process in China, it is necessary to summarize the ex-isting system evaluation and evaluate the quality of it, so as to provide strong evidence for the development of relevant work and to standardize the research process and methods in this field. This study evaluated the quality of recent systematic reviews and meta-analyses on MedSD and cognitive outcomes by using an established methodology quality scale, and to provide some valuable references for future research and Chinese systematic review and meta-analysis developing. Methods: We used the AMSTAR Methodology Quality Assessment Scale to evaluate the quality of methodology of the existing meta-analyses and systematic review. Meta analysis and systematic review that meets our criteria must contain the following characteristics: 1) used systematic or meta-analytic procedures to review the lit-erature, and 2) had MedSD interventions independently. Results: Reviews satisfied with 5 to 9 of the AMSTAR MedSD items (mean 7.35, standard deviation: 1.27), quality is above average with those published in higher-impact journals having a greater quality score. Conclusion: These data suggest that current meta-analyses/systematic reviews evaluating the effect of MedSD on cognitive do not fully meet contemporary methodology quality standards. The methodological quality of the literature needs to be improved. As a result, there are more research questions to answer to enhance our understanding of how MedSD affects cognitive. To clarify associations between MedSD and cognitive, future meta-analyses and systematic reviews should not only follow methodology quality standards but also include more statistical modeling results when data allow. And in order to make the conclusions more reliable, we expect higher quality RCTs in the future.



Key wordsCognitive      Mediterranean diet      Meta-analysis      Methodological quality      Systematic reviews     
Published: 24 September 2018
Corresponding Authors: Meng Fan-Jie     E-mail: mfj1127@126.com.
Cite this article:

Yuan Jia, Si-Yuan Yang, Li-Ming Guo, Qian Wu, Fan-Jie Meng. Methodologic quality of systematic reviews and meta-analyses on the Mediterranean diet and cognitive function: a review. TMR Integrative Nursing, 2018, 2(3): 101-107.

URL:

https://www.tmrjournals.com/in/EN/10.12032/TMRIN20180709     OR     https://www.tmrjournals.com/in/EN/Y2018/V2/I3/101

Figure 1 Flow chart detailing search of potential systematic reviews and selection process of included reviews. CNKI, China National Knowledge Infrastructure.
First Author Publication year Country Number of included studies Outcome indicators
Wu L[29] 2017 China 9 a,b,d
Petersson SD[25] 2016 America 32 a,b,c
Psaltopoulou T[26] 2013 Greece 22 a,b,e,
Singh B[28] 2014 America 5 a,b
Radd-Vagenas S[27] 2018 Australia 5 a,b,c
Masana MF[24] 2017 Australia 31 a,b,c,d
Hardman RJ[21] 2016 Australia 18 a,b,c
Loughrey DG[22] 2017 Britain 17 a,b,c,d
Lourida I[23] 2013 Britain 12 a,b
Table 1 Summary of the 10 systematic reviews or meta-analyses that qualified for this review
AMSTAR question Yes Part No
1. Was an a priori design provided? . 9 0 1
2. Was a comprehensive literature search performed? 7 0 3
3. Is it possible to replicate the search? 8 0 2
4. Did the inclusion criteria permit gray literature? 3 1 6
5. Was a list of studies (included and excluded) provided? 0 0 10
6. Were the characteristics of the included studies provided? 8 1 1
7. Was the scientific quality of the included studiesassessed and documented? 7 0 3
8. Were the methods used to combine the findings of studies appropriate? 10 0 0
9. Was the effect size index chosen justified statistically? 8 1 1
10. Was the likelihood of publication bias assessed? 7 1 2
11. Was the conflict of interest included? 5 0 5
Table 2 Quality of systematic reviews and meta-analyses
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