SynthesisBMJ open2025
Health risk behaviours, mental health and HbA1c: an overview of reviews of observational studies.
Synthesis in BMJ open, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
0 citing papers in PubMed.
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Corrections and comments
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Authors and funding
8 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
objectivesTo implement an overview of reviews that discuss the current state of syntheses (such as systematic reviews) of only observational studies on health risk behaviours (HRBs), including smoking, alcohol intake, poor sleep, poor quality diet, common mental health problems (depression and anxiety), and glycated haemoglobin (HbA1c), while excluding synthesis of clinical trials.
designOverview of reviews or umbrella review following Preferred Reporting Items for Overviews of Reviews (PRIOR) guidelines. DATA SOURCES: PubMed, Scopus, Web of Science, PsycINFO-PsychArticles and Epistemonikos, searched from January 2013 to 30 June 2025. ELIGIBILITY CRITERIA: We included systematic reviews and meta-analyses of observational studies that assessed the relationship between HRBs-including smoking, alcohol intake, poor sleep, poor quality diet, physical activity and common mental health problems such as depression and anxiety-and HbA1c. Reviews of clinical trials were excluded. DATA EXTRACTION AND SYNTHESIS: We synthesised systematic reviews and meta-analyses on the above topic from five databases following the PRIOR protocol. Two independent reviewers screened titles, abstracts and full texts using standardised methods. Data extracted included study design, exposures, outcomes and population characteristics. Risk of bias was assessed using the AMSTAR-2 tool. Overlap across reviews was evaluated using the corrected covered area metric.
resultsEight systematic reviews were included in the final synthesis, encompassing a total sample size of around 307 019 individuals. The study highlights a significant paucity of systematic reviews of observational studies in this area, with no reviews on alcohol and exercise. The existing evidence on poor sleep, poor quality diet and smoking points towards these HRBs leading to worse HbA1c. A bidirectional relationship was found between depression and HbA1c.
conclusionsThis umbrella review highlights the significant association between HbA1c and key health risk factors underscoring the importance of observational studies, highlighting their ability to capture real-world conditions and complex interactions. While in agreement with existing study designs, this review provides convergent evidence of the critical role of HRBs in managing HbA1c levels.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the Socratic graph.