期刊
CRITICAL REVIEWS IN TOXICOLOGY
卷 51, 期 6, 页码 467-508出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/10408444.2021.1965086
关键词
Systematic review; ozone; metabolic syndrome; diabetes; overweight; obesity
类别
The study applied a transparent approach to systematically review the evidence on ozone inhalation exposure and adverse metabolic effects. The evidence for the health outcomes assessed was generally weak, with some indications lacking or suggestive details, but overall lacking strong evidence support.
We utilized a practical, transparent approach for systematically reviewing a chemical-specific evidence base. This approach was used for a case study of ozone inhalation exposure and adverse metabolic effects (overweight/obesity, Type 1 diabetes [T1D], Type 2 diabetes [T2D], and metabolic syndrome). We followed the basic principles of systematic review. Studies were defined as Suitable or Supplemental. The evidence for Suitable studies was characterized as strong or weak. An overall causality judgment for each outcome was then determined as either causal, suggestive, insufficient, or not likely. Fifteen epidemiologic and 33 toxicologic studies were Suitable for evidence synthesis. The strength of the human evidence was weak for all outcomes. The toxicologic evidence was weak for all outcomes except two: body weight, and impaired glucose tolerance/homeostasis and fasting/baseline hyperglycemia. The combined epidemiologic and toxicologic evidence was categorized as weak for overweight/obesity, T1D, and metabolic syndrome,. The association between ozone exposure and T2D was determined to be insufficient or suggestive. The streamlined approach described in this paper is transparent and focuses on key elements. As systematic review guidelines are becoming increasingly complex, it is worth exploring the extent to which related health outcomes should be combined or kept distinct, and the merits of focusing on critical elements to select studies suitable for causal inference. We recommend that systematic review results be used to target discussions around specific research needs for advancing causal determinations.
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