Prevalence Of Symptoms Associated With Occupational Exposure To Benzene, Toluene, Ethylbenzene A

28 Apr 20265 min read0 viewsJournal Feed

GIST

Introduction Gas station workers are at increased risk of inhaling volatile chemical compound vapours that may cause headaches, dizziness, fatigue, eye and nasal irritation, as well as haematological and neurological changes. This systematic review aims to estimate the prevalence of symptoms associated with occupational exposure to benzene, toluene, ethylbenzene and xylene vapours among fuel station workers.

Methods and analysis The review will be conducted between February and July 2026. Literature searches will be carried out between February and March 2026 across the Medical Literature Analysis and Retrieval System Online (PubMed/MEDLINE), Scopus, Embase, Web of Science, Latin American and Caribbean Health Sciences Literature (LILACS) and Cumulative Index to Nursing and Allied Health Literature (CINAHL) databases.

Grey literature will be searched using OpenGrey. Eligible studies will include cross-sectional and case-control designs.

No language or publication date restrictions will be applied. The systematic review will adhere to the Preferred Reporting Items for Systematic Reviews and Meta-Analyses guidelines.

Two reviewers will independently select the studies, assess their eligibility using predefined criteria and standardised forms, and extract data.

Clinical Editorial

Scope and objective: Clarifying the focus of exposure-linked symptom prevalence

The article outlines a protocol to quantify how often gas station workers report symptoms linked to vapours from benzene, toluene, ethylbenzene, and xylene exposure.
Reported symptoms include neurological and nonspecific systemic effects such as headaches, dizziness, fatigue, and irritation of eyes or nose, with potential haematological and neurological implications implied but not elaborated beyond listing categories.

Study design and methodological framework: planned approach and standards

The review is scheduled to occur between February and July 2026, with literature searches conducted primarily in February–March 2026.
Databases to be searched include PubMed/MEDLINE, Scopus, Embase, Web of Science, LILACS, and CINAHL; grey literature will be sought via OpenGrey.
Eligible designs are cross-sectional and case-control studies, without language or publication date restrictions.
The review will follow PRISMA guidelines and employ independent dual screening, eligibility assessment, and data extraction using predefined criteria and standardized forms.
A random effects model will be used to compute pooled prevalence estimates with 95% confidence intervals.

Data appraisal and synthesis: bias assessment and certainty

Risk of bias will be evaluated with the Joanna Briggs Institute tool for cross-sectional studies and the Newcastle-Ottawa Scale for nonrandomized designs.
Overall certainty of evidence will be judged using the GRADE framework.
Analyses will be conducted with RevMan (version 5.3.5), enabling both qualitative and quantitative synthesis.

Population, exposure, and outcome scope: what will be examined

Population comprises fuel station workers exposed to vapours from benzene, toluene, ethylbenzene, and xylene.
Primary outcome centers on the prevalence of symptoms associated with such vapour exposure.
The protocol does not provide numerical results or specific symptom prevalence values, as it describes planned methods for a future synthesis.

Ethics, dissemination, and reporting limits: transparency and cautions

Ethical approval is deemed unnecessary because the study uses only secondary data.
Findings are intended for dissemination through conferences, peer-reviewed journals, and communications with workers, employers, and policy-makers.
The protocol explicitly notes potential limitations related to the availability and quality of included studies, with uncertainty acknowledged where evidence is incomplete.